(2) Lab Exam Flashcards Preview

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Flashcards in (2) Lab Exam Deck (16):
1

origin

the stationary, immovable, or less movable muscle attachment

2

insertion

the movable muscle attachment

3

agonist

AKA PRIME MOVER, the muscle that is primarily responsible for producing a particular movement

4

antagonist

muscles that oppose or reverse a particular movement

5

synergist

muscles that assist agonist by reducing undesirable/unnecessary movement

6

fixator

specialized synergists that immobilize the origin of the agonist so all the force can be exerted at the insertion

7

pectoralis major

Action - prime mover of arm flexion; adducts, medially rotates arm
Origin - clavicle, sternum, cartilage of ribs 1-6, and aponeurosis of external oblique
Insertion - intertubercular sulcus of humerus

8

rectus abdominis

Action - flexes and rotates vertebral column
Origin - pubic crest and symphysis
Insertion - Xiphoid process and costal cartilages of ribs 5-7

9

trapezius

Action - stabilizes, raises, rotates, and retracts scapula
Origin - occipital bone, spines of C7 and all thoracic vertebrae
Insertion - acrlaeomion and spinous process of scapulae, also lateral portion of clavicle

10

levator scapulae

Action - elevates and adducts scapula
Origin - transverse processes of C1-C4
Insertion - medial border of scapula superior to the spine

11

biceps brachii

Action - flexion of elbow and supination of forearm
Origin - short: coracoid process, long: supraglenoid tubercle/tip of glenoid cavity
Insertion - radial tuberosity

12

adductor longus

Action - adduct and medially rotate and flex thigh
Origin - pubis near pubic symphysis
Insertion - linea aspera

13

gluteus maximus

Action - major extensor of thigh
Origin - dorsal ilium, sacrum, and coccyx
Insertion - gluteal tuberosity of femur and iliotibial tract

14

biceps femoris

Action - extends thigh and flexes knee
Origin - long: ischial tuberosity; short: linea aspera and distal femur
Insertion - head of fibula, lateral condyle of tibia

15

gastrocnemius

Action - plantar flexes foot
Origin - medial and lateral condyles of femur
Insertion - calcaneus via calcaneal tendon

16

vastus lateralis

Action - extends and stablizes knee
Origin - greater trochanter, intertrochanteric line, and linea aspera
Insertion - tibial tuberosity and patella