Muscles Flashcards
Sternocleidomastoid origin
Sternal head -> top of the manubrium
Clavicular head -> medial third of the clavicle
Sternocleidomastoid insertion
Mastoid process of the temporal bone and the lateral portion of the superior nuchal line of the occiput.
Sternocleidomastoid actions
Bilaterally flexes the neck and assists to elevate the rib cage during inhalation. Unilaterally rotates the head and neck to the opposite side and laterally flexes the head and neck.
Rotation of the head and neck occurs at which joints?
The spinal joints.
Lateral flexion of the head and neck occurs at which joints?
Spinal joints.
Sternocleidomastoid innervation
Spinal accessory nerve (C2&3)
Sternocleidomastoid trigger point referral patterns
The sternal head is above the eye and the clavicular head is aboves the eyes and on the ear.
Anterior scalene origin
Tranvserse processes of C3-C6
Anterior scalene insertion
First rib
Anterior scalene actions
Bilaterally elevate the ribs during inhalation and flex the head and neck. Unilaterally rotate the head and neck to the opposite side and laterally flex the head and neck.
Anterior scalene innervation
Cervical spinal nerves
Scalene trigger point referral patterns
Shoulder, pectorals, medial scapula
Middle scalene origin
Transverse processes of C2-C7
Middle scalene insertion
First rib
Middle scalene actions
Bilaterally elevate the ribs during inhalation. Unilaterally rotate the head and neck to the opposite side and laterally flex the head and neck.
Middle scalene innervation
Cervical spinal nerves.
Posterior scalene origin
Transverse processes of C6-C7
Posterior scalene insertion
Second rib
Posterior scalene actions
Bilaterally elevates the ribs during inhalation. Unilaterally rotates the head and neck to the opposite side and laterally flexes the head and neck.
Posterior scalene innervation
Cervical spinal nerves
Path of the brachial plexus
Between the anterior and middle scalenes.
Levator scapula origin
Transverse processes of C1-C4