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Muscle Anatomy Quiz 1 > Muscles > Flashcards

Flashcards in Muscles Deck (16):
1

Muscles

Contractile organ that can produce movement over a joint.



•Insertion – Distal attachment
•Moveable attachments

2

Origin-

Proximal attachment
More stable

3

Insertion

Distal attachment

Moveable attachments

4

Muscle Insertion Actions

Traditional Action – distal attachment moves towards the proximal attachment – FOCUS for this class

Reverse Action- proximal attachment moves towards distal attachment – we will talk about a few but we will use this more in Kinesiology

5

Agonist


Prime mover
Primary muscle performing the action

6

Antagonist

Performs action opposite to agonist

Relaxes and agonist contracts or lengthens

7

Isometric



same length – contraction of agonists and antagonists so there is tension in muscle but no movement

8

Concentric

shortening contraction of the muscle

9

Eccentric

lengthening contraction usually to control movements against gravity. For example slowly lower arm down from flexed position

10

Muscle Fiber Orientation

The action of the muscle can be determined by the direction of the fibers.

11

Tendon

which is a highly organized dense connective tissue of collagen fibers which attaches muscle to bone

12

Ligaments

attach bone to bone and provide stability to the joint

13

Attachments

the muscle name is the origin and insertion of the muscle
•Example – Brachioradialis
•Coracobrachialis

14

Function

Extensor digitorum communis – common extensor of the digits

15

Appearance

Rhomboid major – shaped like a rhombus and is large

16

Combination

function and appearance
•Pronator quadratus – pronator of the forearm and quadrate (square) in shape