Anatomy: Neck


Posterior Neck

MuscleAttachementsNerve Supply Actions
Levator Scapulae O: Transverse process of C1- C4 vertebrae
I: Superior angle of scapula
Dorsal Scapular Nerve
Cervical ( C3, C4) Nerve
– Elevates scapula
Splenius Capitus O: Inferior half of nuchal ligament, spinous processes of T1-T6 vertebrae
I: Lateral aspect of mastoid process, lateral thirds of superior nuchal line
Posterior Rami of Middle Cervical Spinal Nerves – Laterally flexes neck
– Rotates neck to same side
– Extends neck bilaterally
Splenius Cervicus O: Inferior half of nuchal ligament, spinous processes of T1-T6 vertebrae
I: Transvere processes of C1 – C3/ C4 vertebrae
Posterior Rami of Middle Cervical Spinal NervesLaterally flexes neck
– Rotates neck to same side
– Extends neck bilaterally
Suboccipitals
( Rectus capitis posterior mj; RCP+, Rectus capitis posterior minor; RCP-, Oblique capitis inferior; OSI, Oblique capitis superior; OCS)
RCP+
O: Spinous proces of C2 vertebra
I: Lateral part of inferior nuchal line
RCP-
O: Posterior arch of C1 vertebra
I: Medial third of inferior nuchal line
OCI
O: Spinous process of C2 vertebra
I: Transverse process of C1 vertebra
OCS
O: Transverse process of C1
I: Occipital bone between superior and inferior nuchal lines
Suboccipital Nerve – Extend head at C1
– Rotated head at C1

Anterior and Lateral Neck

MuscleAttachementsNerve SupplyActions
Anterior ScaleneO: Transverse processes of C3- C6
I: 1st rib
Cervical Spinal Nerves ( C4- C6)– Flexes neck laterally
-Elevates 1st rib during forced inspiration
Middle ScaleneO: Transverse processes of C4-C7
I: 1st rib
Anterior Rami of cervical spinal nerves C7 and C8– Flexes neck laterally
– Elevates 1st rib during forced inspiration
Posterior ScaleneO: Transverse processes of C4-C6
I: 2nd rib
Anterior Rami of cervical spinal nerves C7 and C8-Flexes neck laterally
– Elevate2nd rib during forced inspiration
SternocleidomastoidO: Lateral surface of mastoid process and lateral half of superior nuchal line
I:Anterior surface of manubrium of sternum, superior surface of medial third of clavicle
Spinal Accessory Nerve– Tilts head to same side
-Rotates head so face is turned towards opposite side
– Extends neck at C0-C1, bilaterally
– Flexes cervical vertebrae bilaterally

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