Anatomy 9A: Muscles Flashcards

Terms Definitions
Supinator(action)
Supinates forearm
Corrugator
Location: Face
Occipitalis innervation
Facial nerve
Levator
Produces superior movement
FLEXOR MUSCLES ORIGIN
MEDIAL EPICONDYLE
Flexor Pollicis Longus(innervation)
Median nerve
Buccinator - Insertion
orbicularis oris
Extensor Hallucis innervation
Deep peroneal nerve
Myofibril
Rodlike contractile element which occupies most of the muscle cell volume. Composed of sacromeres arranged end to end.
flattens, increasing length of thoracic cage, during normal inspiration
diaphragm
FLEXORS - LATERAL, MEDIAL OR POSTERIOR?
MEDIAL
pectoralis minor
depresses and protracts the scapula
Extensor Digiti Minimi(origin)
Lateral epicondyle of humerus
flexes and medially rotates arm; reists deviation of arm from frontal plane during abduction
coracobrachialis
diaphragm
a muscular, membranous or ligamentous wall separating two cavities or limiting a cavity.
Biceps Femoris
This muscle can extend, laterally rotate, and adduct the thigh, as well as flex the knee.
Buccinator action
Draws corner of mouth laterally; compresses cheek (as in whistling and sucking); holds food between teeth during chewing; well developed during nursing infants
orbicularis oculi
closes each eye as in blinking
Abductor Pollicis Longus(origin)
Dorsal surface of radial shaft
draws angle of mouth laterally in expressions of laughing, horror, or disdain
risorius
skeletal muscle functions
-locomotion, posture, stabiize joints, generate heat
biceps brachii
either of two flexor muscles, one
Gluteus Maximus
The major muscle of the rear end.
Biceps Femoris action
Extends thigh and flexes knee; laterally rotates leg, especially when knee is flexed
rectus femoris
flexes the thigh and extends the leg
Abductor Pollicis Longus(action)
Abducts, laterally rotates and extends thumb
effects of resistance exercise
muscle hypertrophy (increased size), -increased mitochondria, myofilaments, and glycogen stores
buccinator
a thin, flat muscle lining the cheek, the action of which contracts and compresses the cheek.
Greater Trochanter
Process on the outer thigh to which several muscles are attached.
Flexor Digitorum Longus action
Plantar flexes and inverts foot; flexes toes; helps foot “grip” ground
Flexor Carpi Ulnaris action
Powerful flexor of wrist; also adducts hand in concert with extensor carpis ulnaris (posterior muscle); stabilizes wrist during finger extension
muscle belly
large mass of muscle that powers the work of the mvmt (usually located btwn two tendons that attach onto adjacent bones - passes over a joint)
gracilis
a muscle in the inner side of the thigh, the action of which assists in drawing the legs inward and in bending the knee.
Rectus Abdominus origin and insertion
origin: Pubic crest and symphysis; insertion: Xiphoid process and costal cartilages of ribs 5-7
Pronator Teres origin and insertion
origin: Medial epicondyle of humerus; coronoid process of ulna; insertion: By common tendon into lateral radius, midshaft
Sternocleidomastoid - Bilateral Action
flexes the neck, raises the sternum and assists in forced inspiration.
Muscle of the PharynxLevator Veli Palatini
Action= Elevates soft palate when swallowingOrigin- Temporal boneInsertion- Soft palate
skeletal muscle tissue properties
-attach to and covers skeletal bones - obvious stripes (striations) - voluntary (conscious control) - body motility - extremely adaptable
The ability to respond to stimuli by producing action potentials is...
1. called electrical excitability 2. a property of muscle tissue
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