Ch 3 Muscles of Cranium, Face, and Neck Flashcards
What is the function of the muscular system?
produce all movement of the body
How many muscles for the entire body?
600
a broad muscle that covers the top of the skull; consists of two parts
This muscle draws the scalp posteriorly and anteriorly, causing eyebrows to raise and wrinkles to form on the forehead
Occipitofrontalis (epicranius)
a broad muscle arising in the temporal cavity and inserting in the mandible
a muscle of mastication and is the strongest chewing muscle; closes the mandible; assists in side-to-side movement of the mandible; attaches to the coronoid process of mandible
Temporalis
a muscle arising from the zygomatic arch and inserting in the mandible
a muscle of mastication; closes the mandible; attaches to angle of manible
Masseter
this sphincter muscle surrounds the eye socket
closes the eyelid and compresses the lacrimal sac
Orbicularis oculi
a pyramid-shaped muscle of facial expression; lies beneath the frontalis and orbicularis oculi; known as the frowning muscle
draws the eyebrows inferiorly and medially; frowning
Corrugator
muscle of facial expression that runs from the inside of the eye socket to the superior tarsal plate of the eyelid
raises the superior eyelid
Levator palpebrae superioris
covers the bridge of the nose
draws the skin of the forehead inferiorly, causing transverse and vertical wrinkles in the forehead
Procerus
a flat band of muscles in the upper and lower red lips and integumentary lips
closes the lips; compresses lips against teeth; shapes lips during speech
Orbicularis oris
(puckering muscle)
a muscle of facial expression
raises the upper lip and dilates the nostrils
Levator labii superioris alaeque nasi
muscle of facial expression
elevates AND extends the upper lip
Levator labii superioris
a small muscle at the angle of the mouth
elevates the angle of the mouth
Levator anguli oris
Muscle of the face
draws the upper lip superiorly and laterally (out)
Zygomaticus minor
Extends from the cheekbone to the angle of the mouth
draws the upper lip posteriorly, superiorly, and laterally as in smiling or laughing
Zygomaticus major
(laughing muscle)
the principle muscle of the ckeek. Oringinates in the skin over the molar teeth and inserts into the skin at the anguli oris ( corners of the mouth). Makes up part of the angulus oris eminences
compresses the cheek; retract angle of the mouth; pulls the anguli oris posteriorly; produces the action of sucking
Buccinator
(trumpeters muscle)
extends from the skin over the masseter muscles to the corners of the mouth
draws corners of the mouth anteriorly
Risorius
(false smile muscle)
a muscle of facial expression that arises from the mandible to insert into the anguli oris
depresses the angle of the mouth
Depressor anguli oris
(Triangularis)
A muscle of facial expression
depresses the lower lip inferiorly and slightly laterally
Depressor labii inferioris
(Quadratus)
this muscle is located on the tip of the chin
elevates and protrudes the lower lip; also wrinkles the skin over the chin
Mentalis
thin layer of muscle covering the anterior aspect of the neck
wrinkles the skin of the neck and chest; also depresses the mandible and anguli oris. as in pouting
Platysma
a thick muscle that irginates from the head of the sterum and clavial, and inserts at the mastoid process of the temporal bone
rotates and depresses the head;widest part of the neck
Sternocleidomastoid
(SCM)
a double-bellied muscle of the neck, which attaches to the mastoid process and the mandible
draws the hyoid bone superiorly and anteriorly
Digastric
Sphincter muscle
encircling
Ex. mouth and eyes
Where is most pigment found?
Hair
