Neck and Muscles of Mastication Flashcards

A complete set of 72 vocabulary-style flashcards covering the origin, insertion, innervation, and action of neck muscles and muscles of mastication based on the lecture transcript.

Origin of the Platysma

Skin and fascia overlying pectoralis major and deltoid

Insertion of the Platysma

Inferior border of mandible and skin of lower face

Innervation of the Platysma

Facial nerve ($CN VII$)

Action of the Platysma

Tenses skin of neck

Origin of the Sternocleidomastoid (Sternal head)

Manubrium

Origin of the Sternocleidomastoid (Clavicular head)

Medial part of clavicle

Insertion of the Sternocleidomastoid

Mastoid process of temporal bone and lateral portion of superior nuchal line of occipital bone

Innervation of the Sternocleidomastoid

Accessory nerve ($CN XI$)

Unilateral Action of the Sternocleidomastoid

Side bending to the same side and rotation to opposite side

Bilateral Action of the Sternocleidomastoid

Flexion of head

Origin of the Digastric (Anterior belly)

digastric fossa of mandible

Origin of the Digastric (Posterior belly)

mastoid process of temporal bone

Insertion of the Digastric

Intermediate tendon connected to hyoid bone

Innervation of the Digastric (Anterior belly)

Branch of trigeminal nerve ($V_3$)

Innervation of the Digastric (Posterior belly)

Facial nerve ($CN VII$)

Action of the Digastric

Elevates hyoid during swallowing

Origin of the Stylohyoid

Styloid process of temporal bone

Insertion of the Stylohyoid

Hyoid

Innervation of the Stylohyoid

Facial nerve ($CN VII$)

Action of the Stylohyoid

Elevates and retracts hyoid during swallowing

Origin of the Mylohyoid

Mylohyoid line of mandible

Insertion of the Mylohyoid

Hyoid

Innervation of the Mylohyoid

Branch of trigeminal nerve ($V_3$)

Action of the Mylohyoid

Elevates hyoid during swallowing

Origin of the Geniohyoid

Inferior mental spine of mandible

Insertion of the Geniohyoid

Hyoid

Innervation of the Geniohyoid

$$C_1$$

Action of the Geniohyoid

Pulls hyoid antero-superiorly in swallowing

Origin of the Sternohyoid

Posterior surface of manubrium of sternum and medial clavicle

Insertion of the Sternohyoid

Hyoid

Innervation of the Sternohyoid

Ansa cervicalis ($C_{1, 2, 3}$)

Action of the Sternohyoid

Depresses hyoid after elevation during swallowing

Origin of the Sternothyroid

Manubrium and first costal cartilage

Insertion of the Sternothyroid

Oblique line of thyroid cartilage

Innervation of the Sternothyroid

Ansa cervicalis ($C_{1, 2, 3}$)

Action of the Sternothyroid

Depresses thyroid cartilage after elevation during swallowing

Origin of the Thyrohyoid

Oblique line of thyroid cartilage

Insertion of the Thyrohyoid

Hyoid

Innervation of the Thyrohyoid

Ansa cervicalis ($C_{1, 2, 3}$)

Action of the Thyrohyoid

Depresses hyoid and elevates thyroid

Origin of the Omohyoid (Inferior belly)

upper border of scapula

Origin of the Omohyoid (Superior belly)

intermediate tendon

Insertion of the Omohyoid (Inferior belly)

intermediate tendon

Insertion of the Omohyoid (Superior belly)

hyoid

Innervation of the Omohyoid

Ansa cervicalis ($C_{1, 2, 3}$)

Action of the Omohyoid

Depresses hyoid during swallowing

Origin of the Longus coli

Vertebral Bodies

Insertion of the Longus coli

Vertebral Bodies including anterior tubercle of atlas

Innervation of the Longus coli

Ventral rami of cervical nerves

Action of the Longus coli

Flexes neck

Origin of the Longus capitis

Transverse processes of middle cervical vertebrae

Insertion of the Longus capitis

Basilar part of occipital bone

Innervation of the Longus capitis

Ventral rami of cervical nerves

Action of the Longus capitis

Flexes head

Origin of the Anterior scalene

Anterior tubercles of transverse processes of cervical vertebrae

Insertion of the Anterior scalene

First rib anteriorly

Innervation of the Anterior scalene

Ventral rami of cervical nerves

Action of the Anterior scalene

Neck flexion; side bending of neck to same side; rotation to opposite side

Origin of the Middle scalene

Posterior tubercles of transverse processes of cervical vertebrae

Insertion of the Middle scalene

Posterior part of first rib

Innervation of the Middle scalene

Ventral rami of cervical nerves

Action of the Middle scalene

Side bending of neck to same side; rotation to opposite side

Origin of the Posterior scalene

Posterior tubercles of transverse processes of cervical vertebrae

Insertion of the Posterior scalene

Second rib

Action of the Posterior scalene

Side bending of neck to same side

Origin of the Temporalis

Temporal fossa

Action of the Temporalis

Elevation and retraction of mandible

Origin of the Masseter

Inferior margin of zygomatic arch

Action of the Masseter

Elevation and some protraction of mandible

Action of the Lateral pterygoid

Protraction, depression, and lateral movement of mandible to opposite side

Action of the Medial pterygoid

Protraction, elevation, and lateral movement of mandible to opposite side

Innervation of the Muscles of Mastication

Mandibular Branch of the Trigeminal Nerve ($V_3$)