Head muscles info

Question 1

Buccinator

Answer 1

origin: Posterior portion of alveolar process of maxillary bone and mandible opposite sockets of molar teeth, anterior border of pterygomandibular raphe
insertion: Angle of mouth
movement: Compresses cheeks, expels air between lips, aids in mastication
innervation: Buccal branches of facial nerve

mastication = לעיסה

Question 2

Depressor anguli oris

Answer 2

origin: Continuous with platysma muscle on oblique line of mandible
insertion: Angle of mouth into orbicularis oris muscle and skin
movement: Depresses angle of mouth
innervation: Mandibular and buccal branches of facial nerve

Question 3

Depressor labii inferioris

Answer 3

origin: Lateral surface of mandible between symphysis and mental foramen deep to depressor anguli oris
insertion: Skin to lower lip, mingling with orbicularis oris muscle, medial fibers joining those of opposite side
movement: Depresses lower lip and draws it lateralward
innervation: Mandibular and buccal branches of facial nerve

Question 4

Digastric

Answer 4

origin:Anterior belly: digastric fossa of mandible

Posterior belly: mastoid notch of temporal bone

insertion: Intermediate tendon attached to body of hyoid
action: Raises hyoid bone and base of tongue, steadies hyoid bone, opens mouth by lowering mandible
innervation: Anterior belly: nerve to mylohyoid muscle

Posterior belly: facial nerve

Question 5

Frontal belly of occipitofrontalis

Answer 5

origin: Epicranial aponeurosis at level of coronal suture
insertion: Skin of frontal region, epicranial aponeurosis
action: horizontally wrinkles skin of forehead, raises eyebrows
innervation: Temporal branches of facial nerve

Question 6

Geniohyoid

Answer 6

origin: Inferior genial tubercle on back of symphysis of mandible
insertion: Anterior surface of body of hyoid bone
action: elevates hyoid bone and depresses mandible
innervation: hypoglossal nerve (CN XII)

Question 7

hyoglossus

Answer 7

origin: Body and greater horn of hyoid bone
insertion: Lateral and inferior aspect of tongue
action: depresses and retracts tongue
innervation: Hypoglossal nerve (CN XII)

Question 8

Lateral pterygoid

Answer 8

origin: Superior head: infratemporal surface of greater wing of sphenoid bone

Inferior head: lateral pterygoid plate

insertion: Pterygoid fovea, capsule of temporomandibular joint, articular disc

action:

Bilaterally: protrudes mandible

תרגום: דוחף את המנדיבל קדימה

unilaterally: produces side-to-side grinding
innervation: Mandibular nerve (CN V3)