Anterolateral Neck Muscles (Distinguish Anterior muscles for LOs) Flashcards by Daniel White

Anterior digastric (Suprahyoid) - Attachments

FROM
*digastric fossa of the mandible

TO
*the intermediate tendon (greater cornu of hyoid) (inferior border of mandible near symphysis to intermediate tendon & body and cornu of hyoid)

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Anterior digastric (Suprahyoid) - Actions

*depression of the mandible
OR
*elevation of the hyoid

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Anterior digastric (Suprahyoid) - Innervation

mylohyoid branch of the inferior alveolar n. (from CN V3)

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Posterior digastric (Suprahyoid) - Attachments

FROM
*temporal mastoid notch

TO
*intermediate tendon (greater cornu of hyoid) (mastoid process to intermediate tendon & body and cornu of hyoid)

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Posterior digastric (Suprahyoid) - Actions

*depression of the mandible
OR
*elevation of the hyoid

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Posterior digastric (Suprahyoid) - Innervation

Facial n. (CN VII)

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Mylohyoid (Suprahyoid) - Attachments

FROM
*mylohyoid line of the mandible

TO
*midline raphe
*anterior aspect of body of the hyoid

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Mylohyoid (Suprahyoid) - Actions

elevation of the floor of the oral cavity

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Mylohyoid (Suprahyoid) - Innervation

mylohyoid branch of the inferior alveolar n. (from CN V3)

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Geniohyoid (Suprahyoid) - Attachments

FROM
*inferior genial tubercle of the mandible

TO
*anterior aspect of the body of the hyoid (median ridge of mandible to body of hyoid)

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Geniohyoid (Suprahyoid) - Actions

*elevation of tongue and hyoid
OR
*depresses mandible

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Geniohyoid (Suprahyoid) - Innervation

ventral ramus of C1 via CN XII

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Stylohyoid (Suprahyoid) - Attachments

FROM
*styloid process of temporal bone

TO
*body of hyoid bone

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Stylohyoid (Suprahyoid) - Actions

elevation & retraction of the hyoid

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Stylohyoid (Suprahyoid) - Innervation

Facial n. (CN VII)

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Omohyoid (Infrahyoid) - Attachments

There are both superior and inferior bellies that form cervical triangles

FROM
*superior border of the scapula medial to the scapular notch

TO
*lateral aspect of the hyoid passing through an intermediate tendon sling loosely associated with the clavicle & 1st rib

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Omohyoid (Infrahyoid) - Actions

depression of the hyoid

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Omohyoid (Infrahyoid) - Innervation

ansa cervicalis (C1-3)

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Sternohyoid (Infrahyoid) - Attachments

FROM
*posterior side of the proximal clavicle & adjacent manubrium

TO
*inferior border of body of the hyoid

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Sternohyoid (Infrahyoid) - Actions

depresses the hyoid

Sternohyoid (Infrahyoid) - Innervation

ansa cervicalis (C1-3)

Sternothyroid (Infrahyoid) - Attachments

FROM
*posterior aspect of the manubrium & costal cartilage of 1st rib

TO
*thyroid lamina

Sternothyroid (Infrahyoid) - Actions

depression of the elevated larynx

Sternothyroid (Infrahyoid) - Innervation

ansa cervicalis (C1-3)

Thyrohyoid (Infrahyoid) - Attachments

FROM *thyroid lamina TO *greater horn of the hyoid bone

Thyrohyoid (Infrahyoid) - Actions

*depression of the hyoid OR *elevation of the thyroid cartilage

Thyrohyoid (Infrahyoid) - Innervation

ventral ramus of C1 via XII

Longus capitis - Attachments

FROM *anterior tubercles of the transverse processes of cervical vertebrae TO *basilar occipital bone

Longus capitis - Actions

flexion of the head & neck (bilateral) ipsilateral rotation (unilateral)

Longus capitis - Innervation

ventral rami of cervical spinal n. (C1-3)

Longus colli (L. neck) - Attachments

FROM *cervical vertebral bodies TO *cervical vertebral bodies *transverse processes

Longus colli (L. neck) - Actions

flexion, lateral flexion of the neck and ipsilateral rotation

Longus colli (L. neck) - Innervation

ventral rami of cervical spinal n. (C2-7)

Anterior scalene - Attachments

FROM *anterior tubercles of middle cervical vertebrae TO *scalene tubercle of the 1st rib

Anterior scalene - Actions

*elevation of 1st rib (during forced inspiration) *flexion, lateral flexion, & contralateral rotation of the neck

Anterior scalene - Innervation

lower ventral rami of cervical spinal n.

Middle scalene - Attachments

FROM *transverse processes of cervical vertebrae TO *1st rib

Middle scalene - Actions

*elevation of 1st rib (during forced inspiration) *lateral flexion *contralateral rotation of the neck

Middle scalene - Innervation

lower ventral rami of cervical spinal n.

Posterior scalene - Attachments

FROM *lower cervical transverse processes TO *2nd rib

Posterior scalene - Actions

*elevation of the rib (during forced inspiration) *lateral flexion *contralateral rotation of the neck

Posterior scalene - Innervation

ventral rami of cervical spinal n. (C6-8)

Sternocleidomastoid - Attachments

FROM *lateral aspect of the mastoid process *superior nuchal line TO *manubrium *medial 1/3rd of the clavicle

Sternocleidomastoid - Actions

*flexion, ipsilateral lateral flexion, and extension of the head & neck *contralateral rotation of the head

Sternocleidomastoid - Innervation

accessory n & C1,2

Cricothyroid - Attachments

FROM *cricoid cartilage TO *thyroid cartilage

Cricothyroid - Actions

tension and elongation of the vocal folds

Cricothyroid - Innervation

external laryngeal n. (CN X)