Muscles Flashcards
origin
part of the muscle that does not move and is anchored to the bone; attached closest to the skeleton
belly
middle part of the muscle
insertion
moveable part of the muscle anchored to the bone; attached furthest from the skeleton
epicranius
broad muscle that covers the top of the skull and consists of the occipitalis and frontalis; also called occipitofrontalis
epicranial aponeurosis
tendon that connects the occipitalis and frontalis muscles
frontalis
front (anterior) portion of the epicranius; scalp muscle that raises the eyebrows, draws the scalp forward, and causes wrinkles across the forehead
occipitalis
back (posterior) portion of the epicranius: muscle that draws the scalp backward
sternocleidomastoicleus
neck muscle that lowers and rotates the head; originates at the clavicle and inserts at the temporal bone
platysma
broad muscle extending from the pectoral and deltoid muscles to the side of the chin; responsible for lowering the lower jaw and lip
corrugator
small muscle located between the eyebrows below the frontalis; draws the eyebrow down and wrinkles the forehead vertically
procerus
muscle that covers the bridge of the nose, lowers the eyebrows, and causes wrinkles across the bridge of the nose
temporalis
located near the temple, it opens and closes the jaw
levator palpebrae superioris
thin muscle that controls the movement of the eyelid
orbicularis occuli
ring muscle of the eye socket that closes the eyelids and assists in pumping tears
levator anguli oris
muscle that raises the angle of the mouth and draws it inward
levator labii superioris
muscle that surrounds and elevates the upper lip and dilates the nostrils, as when expressing distaste
zygomaticus minor
muscle that works with the zygomaticus major to make facial expressions
zygomaticus major
muscle that extends from the zygomatic bone to the angle of the mouth; directs the lip outward and upward when laughing or smiling
masseter
originates at the lower part of the zygomatic; moves the mandible, causing the mouth to close
risorius
muscle at the corner of the mouth that draws it out and back, as when grinning
buccinator
muscle of the cheek between the upper and lower jaw that compresses that cheeks and expels air between the lips
orbicularis oris
muscle that circles the mouth and contracts, puckers, and wrinkles the lips
triangularis
muscle at the corner of the lip that extends over the chin and pulls down the corners of the mouth when frowning
depressor labii inferioris
muscle that surronds and lowers the lower lip and draws it to one side, as when expressing sarcasm