Anatomy Lab week 6

circular

convergent

fusiform

parallel

unipennate

bipennate

multipennate

what is an example of circular fascicle arrangement

orbicularis oris

what is an example of convergent fascicle arrangement

pectoralis major

what is an example of fusiform fascicle arrangement

biceps brachii

what is an example of parellel fascicle arrangement

sartorius

what is an example of unipennate fascicle arrangement

extensor digitorum longus

what is an example of bipennate fascicle arrangement

rectus femoris

what is an example of multipennate fascicle arrangement

deltoid

A muscle that crosses on the anterior side of a joint produces

flexion

A muscle that crosses on the posterior side of a joint produces

extension

A muscle that crosses on the lateral side of a joint produces

abduction

A muscle that crosses on the medial side of a joint produces

adduction

origin

 less moveable attachment site

insertion

more moveable attachment site

action

the motion the joint makes when the muscle contracts

innervation

the nerve that supplies the muscle (every muscle will have a nerve)

perfusion

the artery supplying the muscle

Prime mover or agonist

a muscle that has the major responsibility for producing a

specific movement

Antagonist

muscles that oppose or reverse a particular movement

synergiest

help the prime movers, either by adding a little extra force to the

movement being carried out or by reducing undesirable extra movements that the

prime mover may produce

fixator

synergists that hold a bone firmly in place, so that a prime mover has a

stable base on which to move a body part

Isometric contraction

production of muscle tension without a change in length

Isotonic contraction

consistent tension as the muscle contracts

Eccentric contraction

muscle fibers lengthen as the muscle contracts

Concentric contraction

muscle fibers shorten as the muscle contracts

Deltoid

• clavicle, scapula

• humerus

• arm abduction

supraspiatus

• scapula

• humerus

• arm abduction

infraspinatus

• scapula

• humerus

• arm lateral rotation

subscapularis

• scapula

• humerus

• arm medial rotation

teres major

• scapula

• humerus

• extends, medially rotates, adducts arm

teres minor

• scapula

• humerus

• arm lateral rotation

Coracobrachialis 

• scapula

• humerus

• flex and adduct arm

Biceps brachii (Short & long heads)

• short head: scapula

• long head: scapula

• radius

• flex and supinate forearm

Brachialis 

• humerus

• ulna

• flex forearm

Triceps brachii (long, lateral, medial) 

• Long head: scapula

• Lateral & medial: humerus

• ulna

• forearm extension

Anconeus

• humerus

• ulna

• Synergist of triceps for forearm extension

deltoid

teres major

supraspinatus

infraspinatus

teres minor

subscapularis

biceps brachii

biceps brachii: long head

biceps brachii: short head

coracobrachialis

brachialis

triceps brachii

triceps brachii: lateral head

triceps brachii: long head

anconeus