Muscles of Head and Neck Flashcards

1
Q

Semispinalis Capitis

A

Origin: Articular process of inferior cervical & transverse process of superior thoracic vertebrae.
Insertion: Occipital Bone
Action: Bilateral extend head, unilateral laterially flexes neck to same side.
Innervation: Spinal Nerves

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2
Q

Sternocleidomastoid

A

Origin: Sternal end of clavicle and manubrium
Insertion: Mastoid region of skull
Action: Bilateral: Neck Flexion. Unilateral, turns face to opposite side.
Innervation: Accessory nerve (CN XI)

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3
Q

Splenius Capitis

A

Origin: Spinous process/ligament of inferior cervical vertebrae
Insertion: Mastoid process, occipital bone of skull
Action: Bilateral extend head. Unilateral laterally flexes neck to same side.
Innervation: Cervical spinal nerves.

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4
Q

Longissimus Cervicis

A

Origin: Transverse Processes of superior thoracic vertebrae
Insertion: Transverse process of middle and superior cervical vertebrae
Action: Bilateral extend head, Unilateral laterally flexes neck to same side
Innervation: Cervical and thoracic spinal nerves

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5
Q

Longissimus Thoracis

A

Origin: Transverse process of all thoracic and lumbar vertebrae
Insertion: Transverse process of all thoracic vertebrae
Action: Bilateral extension of spine. Unilaterally, lateral flexion of spine.
Innervation: Thoracic and lumbar spinal nerves.

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6
Q

Thyrohyoid

A

Origin: Thyroid cartilage of larynx
Insertion: Hyoid bone
Action: Elevates thyroid, depresses hyoid
Innervation: Hypoglossal nerve

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7
Q

Scalenes (anterior, middle, posterior)

A

Origin: Transverse processes of C2-C4
Insertion: First and second ribs
Action: Elevates ribs 1 & 2
Innervation: Cervical spinal nerves

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