Neck – Anatomy, Nerve, Supply, Functions, Movement

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 4 min read
Patient Tools

Read, save, and share this guide

Use these quick tools to make this medical article easier to read, print, save, or share with a family member.

Article Summary

The neck is the bridge between the head and the rest of the body. It is located in between the mandible and the clavicle, connecting the head directly to the torso, and contains numerous vital structures. It contains some of the most complex and intricate anatomy in the body and is comprised of numerous organs and tissues with essential structure and function for normal physiology....

Key Takeaways

  • This article explains Structure and Function in simple medical language.
Educational health guideWritten for patient understanding and clinical awareness.
Reviewed content workflowUse writer and reviewer profiles for stronger trust.
Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

  • New or worsening weakness, numbness, or loss of coordination.
  • Loss of bladder or bowel control, or numbness around the groin or saddle area.
  • Back or neck pain with fever, recent major injury, cancer history, or unexplained weight loss.
1

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

2

See a doctor

Book a professional medical evaluation if symptoms persist, worsen, recur often, affect daily activities, or occur in a high-risk patient.

3

Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

The neck is the bridge between the head and the rest of the body. It is located in between the mandible and the clavicle, connecting the head directly to the torso, and contains numerous vital structures. It contains some of the most complex and intricate anatomy in the body and is comprised of numerous organs and tissues with essential structure and function for normal physiology. Structures contained within the neck are responsible for breathing, speaking, swallowing, regulation of metabolism, support and connection of the brain and cervical spine, and circulatory and lymphatic inflow and outflow from the head.

Structure and Function

The neck can be envisioned very simply as a pathway (or connection) between the head and the rest of the body. It is home to the proximal esophagus, trachea, thyroid gland, and the parathyroid glands. It provides conduits for blood flow to the brain and head, supports the head and moves it accordingly, and transmits nervous signals from the brain to the rest of the body. It is an intricate part of the body with many different planes and compartments.

The neck separates into two triangles: anterior and posterior, with these divided into additional triangles and anatomic areas. The anterior triangle is surrounded inferiorly by the sternal notch and clavicle, laterally by the sternocleidomastoid, and medially by the trachea, thyroid, and cricoid cartilages. The posterior triangle is bordered posteriorly by the trapezius muscle, anteriorly by the sternocleidomastoid muscle, and inferiorly by the clavicle.

The anterior triangle is subdivided into four smaller segments (also triangles): the submental, submandibular, carotid, and muscular triangles.

  • The submental triangle, also called the suprahyoid triangle, contains the mylohyoid muscle as its floor. Inferiorly, its border is the hyoid bone. Medially, its border is the midline of the neck. Posteriorly, the border is the anterior belly of the digastric.
  • The submandibular triangle, or the submaxillary triangle, is superiorly bordered by the mandible. The other portions of the triangle are the anterior and posterior bellies of the digastric muscle.
  • The carotid triangle, or the superior carotid triangle, is bordered posteriorly by the sternocleidomastoid muscle, anteriorly by the omohyoid muscle, and superiorly by the stylohyoid muscle and posterior belly of the digastric. The thyrohyoid, hyoglossus, middle pharyngeal constrictor, and inferior pharyngeal constrictor muscles form the floor of the carotid triangle.
  • The muscular triangle, or the inferior carotid triangle, is bordered medially by the midline of the neck, superiorly by the superior belly of the omohyoid, and posteriorly by the sternocleidomastoid.

The posterior triangle is divided into the occipital triangle and subclavian triangle by the inferior belly of the omohyoid muscle.

The neck also has several layers of fascia, but the two main divisions are superficial and deep fascia.

The superficial cervical fascia extends from the head down to the thorax and axillae. In the neck, it contains the superficial lymph nodes, cutaneous nerves, external and anterior jugular veins, and the platysma muscle. It is arranged loosely to allow for neck movement.

The deep cervical fascia subdivides into the superficial layer of deep cervical fascia, the middle layer of deep cervical fascia, and the deep layer of deep cervical fascia.

  • The superficial layer of deep cervical fascia, or investing layer, lies between the muscles of the neck and the superficial cervical fascia, encircling the sternocleidomastoid and trapezius muscles. It attaches inferiorly to the scapula, clavicle, and manubrium. Superiorly, it attaches to the mandible, mastoid process, superior nuchal line, and external occipital protuberance.
  • The middle layer of deep cervical fascia, or the pretracheal layer, runs from the mediastinum inferiorly to the skull base superiorly. It has a muscular and visceral division. The muscular division encloses the strap muscles, sternohyoid, sternothyroid, omohyoid, and thyrohyoid muscles. The visceral division encloses the larynx, pharynx, esophagus, thyroid, parathyroid glands, trachea, and recurrent laryngeal nerve.
  • The deep layer of deep cervical fascia, or prevertebral layer, runs from the skull base to the mediastinum. Its two divisions are the alar and prevertebral layers. These layers surround the deep muscles of the neck and the cervical vertebrae, forming part of the retropharyngeal space.
Patient safety assistant

Check your symptom safely

Hi, I am RX Symptom Navigator. I can help you understand what to read next and what warning signs need care.
Warning: Do not use this in emergencies, pregnancy, severe illness, or as a substitute for a doctor. For children or teens, use with a parent/guardian and clinician.
A rural-friendly guide: warning signs, when to see a doctor, related articles, tests to discuss, and OTC safety education.
1 Symptom 2 Severity 3 Safe guidance
First safety question

Is there chest pain, breathing trouble, fainting, confusion, severe bleeding, stroke-like weakness, severe injury, or pregnancy danger sign?

Choose quickly

Browse by body area
Start here: Write or select a symptom. The guide will show warning signs, doctor guidance, diagnostic tests to discuss, OTC safety education, and related RX articles.

Important: This tool is educational only. It cannot diagnose, treat, or replace a doctor. OTC information is not a prescription. In an emergency, contact local emergency services or go to the nearest hospital.

Doctor visit helper

Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider
Tests to discuss with doctor
  • Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
  • Relevant blood, urine, imaging, or specialist tests only after clinical assessment
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Patient care roadmap

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

Add references, clinical guidelines, textbooks, journal articles, or trusted medical sources here. You can edit this area from the RX Article Professional Blocks panel.

More from this topic
  1. Enlarged Nasopharyngeal Tonsil

    Enlarged nasopharyngeal tonsil means the adenoid has become bigger than normal. The adenoid is a patch of lymph tissue high at the back of the nose,...

    April 4, 2026 • Rx ENT, Oral and Dental Health (A - Z)
  2. Enlarged Adenoids

    Enlarged adenoids mean the adenoid tissue at the back of the nose has become bigger than normal. The adenoids are part of the body’s immune system....

    April 4, 2026 • Rx ENT, Oral and Dental Health (A - Z)
  3. Adenoid Hypertrophy

    Adenoid hypertrophy? means the adenoids are bigger than normal. The adenoids are soft lymph tissue at the back of the nose, high in the throat, and...

    April 4, 2026 • Rx ENT, Oral and Dental Health (A - Z)
  4. Undescended Shoulder Disease

    Undescended shoulder disease is not the usual medical name. Doctors usually call this condition Sprengel deformity, Sprengel shoulder, congenital? high scapula, or congenital? elevation of the...

    April 3, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  5. Sprengel Deformity

    Sprengel deformity is a birth condition in which one shoulder blade, called the scapula, stays higher than normal because it does not move down to its...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  6. High Shoulder Blade

    A high shoulder blade usually means one shoulder blade sits higher than normal from birth. The medical name is Sprengel deformity or congenital? high scapula. “Scapula”...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  7. High Scapula

    High scapula is a condition where one shoulder blade sits higher than normal on the back from birth. Doctors usually call it Sprengel deformity, congenital? high...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  8. Upward Displacement of the Scapula

    Upward displacement of the scapula usually means congenital? elevation of the scapula, which is most often called Sprengel deformity or Sprengel shoulder. In this condition, one...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  9. Congenital Elevation of Scapula

    Congenital? elevation of scapula means a baby is born with one shoulder blade sitting higher than normal. The shoulder blade is called the scapula. In this...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  10. Isolated Congenital Elbow Dislocation

    Isolated congenital? elbow dislocation is a very rare condition present from birth. In most medical papers, the more exact name is congenital? radial head dislocation, because...

    April 2, 2026 • Gastrointestinal, Pelvic & Liver Disease, (A - Z)