NECK MUSCLE ANATOMY

INTRODUCTION OF NECK MUSCLES

 

 

 

1) LONGUS CAPITIS

Origin : Anterior tubercle of C3 – C6 vertebrae.
Insertion : Basillary portion of occipital bone .
Action : Flexion of head and neck.
Nerve supply : Cervical plexus.
 
Blood supply : Deep cervical artery .

2) LONGUS COLI

Origin : Anterior tubercle and anterior surface of vertebral bodies (C 3- C 7 ).
 
Insertion : Anterior arch of atlas .
Action : Neck flexion , rotation and lateral bend.
Nerve supply : cervical and brachial plexus.
Blood supply : Deep cervical artery .

3) ANTERIOR SCALENE

 
Origin : Anterior tubercle of transverse process of C3- C6 .
Insertion : Scalene tubercle of first rib.
Action : Elevation of first rib, flexion and lateral bend of neck.
Nerve supply : Brachial plexus.
 
Blood supply : Ascending cervical artery .

 


4) MIDDLE SCALENE 

Origin : Posterior tubercle of transverse process of C2- C7.
Insertion : on Upper surface of first rib behind the subclavian artery.
Action : Flexion and lateral bend of neck.
Nerve supply : Brachial plexus C3 – C8.
 

Blood supply : Ascending cervical artery.

 


5) POSTERIOR SCALENE

Origin : Posterior Tubercle of transverse process of C5- C7.
 
Insertion : Second rib ( lateral surface).
 
Action : Flexion and lateral bend of neck
 
Nerve supply : Brachial plexus C7- C8.

Blood supply : Ascending cervical artery.

 

6) STERNOCLEIDOMASTOID

Origin : 
from Sternal head – Anterior surface of manubrium .
from Clavicular head – Medial one – third of clavicle.
Insertion : on Mastoid process and lateral 1/2 of superior nuchal line.
Action : Neck flexion.
Nerve supply : Spinal accessory nerve.
 

Blood supply : Sternocleidomastoid branch of occipital artery.

 


7) SPLENIUS

Origin : Ligamentum nuchae.
 
Insertion : Mastoid process and superior nuchal line.
 
Action : Extension and lateral bend of neck.
 
Nerve supply : Dorsal primary Rami of spinal nerve.
 

Blood supply : Deep cervical artery.


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