The document provides an overview of the muscles of the neck, detailing their origins, insertions, actions, and nerve supplies. Key muscles discussed include the sternocleidomastoid, platysma, trapezius, splenius capitis, middle scalene, and others. Each muscle's anatomical and functional characteristics are outlined, highlighting their roles in neck movement and stability.

1. MUSCLES OF NECK
– Priti nishad
Bsc.OTAT

2. Introduction
 Sterno cleidomastaid muscle
 Platysma muscle
 Trapezius muscle
 Splenius capitis muscle
 Middle scalene muscle
 Scalenus anterior muscle
 Levator scapula muscle
 Longus capitis muscle
 Longus colli muscle
 Mylohyaid muscle
 Thyrohyoid muscle

3. Sterno-Cleidomastoid muscle
• Origin: Manubrium and medial
portion of the clavicle
• Insertion: Mastoid process of the
Temporal bone superior nuchal line
• Action: On fixation of the
insertion,the muscle Act as accessory
muscle of inspiration

4. Sterno-Cleidomastoid muscle

5. Platysma muscle
•Origin: Deep fascia of the upper part
Thorax
•Insertion: Lower boarder of the mandible
•Action: Depression of the mandible
• Nerve supply Cervucle branch of facial
Nerve

6. Platysma muscle

7. Trapezius muscle
•Origin: Medial third of superior
nuchal line,external occipital
protuberance,ligamentum,nuchae,7th
cervical spine all the thoracic spines.
•Insertion: Lateral third of clavicle,
acromion process of spine of scapula.
•Action:
•musles extend the neck
• upper fibres of one side lateral flex
the neck.
• Nerve supply: Spinal accessory nerve
motor and C3,4 propriocieptive.

8. Trapezius muscle

9. Splenius capitis muscle
•Origin:
1) Upper four thoracic spine.
2) Lowe part of ligamentum nuchae.
•Insertion: Mastroid process and Outer
parts of superior nuchal line.
•Action: Extension of the neck.
•Nerve supply: Segmental innervation of
spinal nerves.

10. Splenius capitis muscle

11. Middle scalene Muscle
•Origin: Transverse process of lower six
Cervucle vertebrae (2-7).
•Insertion: Upper surface of the first
rib.
•Action: Elevation of the first rib and
lateral flixation of the neck.
•Nerve supply: Segmental from the
ventral Rami of cervical nerve.

12. Middle scalene muscle

13. Scalenus anterior muscle
•Origin: transverse process of thypical
cervical vertebrae (3-6).
•Insertion: Scalene tubercle of the first
rib
•Action: Elevation of first rib and lateral
flexion the neck
•Nerve supply: Segmental From the
ventral rami of 4th,5th
and 6th
cervical
nerves.

14. Scalenus anterior muscle

15. Levator scapula muscle
•Origin: transverse process of upper
four cervical vertebrae
•Insertion: Upper part of medial border
of scapula
•Action: Elevation of scapula
•Nerves supply: C3,4 and dorsal scapula
nerve (C5).

16. Levator scapula muscle

17. Longus capitis muscule
•Origin: Anterior tubercle of transverse
process of C3,C6.
•Insertion: Basilar part of occipital bone.
•Innervation: Anterior Rami of spinal
nerve C1-C3.
•Action: Bilateral contraction – head
flexion;
Unilateral contraction – head
rotation.
•Blood supply: Ascending cervical artery
and the inferior thyroid artery.

18. Longus colli muscle
•Origin: Transverse processes of C5 To T3
•Insertion: Anterior arch of the atlas
•Action: Flexes the neck and head
•Innervation: Anterior Rami of spinal
nerve C2-C6
•Blood supply: Branches of the
vertebral,ascending pharyngeal and
inferior thyroid arteries

19. Mylohyoid muscle
•Origin: Mylohyoid line ( mandilble.
•Insertion : body of hyoid bone and
median ridge.
•Action: raises oral cavity
floor.elevates hyoid,elevates tongue,
depresses mandible.
•Nerve supply: mylohyoid nerve, from
inferior alveolar branch of mandibular
nerve.

20. Thyrohyoid Muscle
•Origin: Angles of thyroid cartilage and
adjacent cricothyroid ligament.
•Insertion: Anterolateral surface of
arytenoid cartilage
• Innervation: Inferior laryngeal nerve(of
recurrent laryngeal nerve(CN X)
•Action: Draws arytenoid cartilage
anteriorly,relaxes vocal ligament.
•Blood supply: Laryngeal branches of
superior and inferior thyroid arteries

21. THANK YOU