A&P Lab 5 and 6

Muscles

Origin of Orbicularis Oris

muscles ear mouth

Insertion of orbicularis oris

skin of central lip

Action of orbicularis oris

pucker lips

origin of external oblique

ribs 5-12

insertion of external oblique

iliac crest, pubis and linea alba

action of external oblique

compresses abdomen and rotates trunk

origin of deltoid

clavicle, acromion, spine of scapula

insertion of deltoid

deltoid tuberosity of humerus

action of deltoid

abduction, flexion, extension and rotation of arm

origin of supraspinatus

supraspinous fossa of scapula

insertion of supraspinatus

greater tubercle of humerus

action of supraspinatus

begins abduction of arm

origin of infraspinatus

infraspinous fossa of scapula

insertion of infraspinatus

greater tubercle of humerus

action of infraspinatus

lateral rotation of arm

origin of teres minor

lateral border of scapulai

insertion of teres minor

greater tubercle of humerus

action of teres minor

lateral rotation of arm

origin of subscapularis

anterior surface of scapula

insertion of subscapularis

lesser tubercle of humerus

action of subscapularis

`medial rotation of arm

origin of biceps brachii

coracoid process (short head); supraglenoid tubercle (long head)

insertion of briceps brachii

radial tuberosity and bicipital aponeurosis

action of biceps brachii

flexion of humerus (short head); flexion of forearm; supination of forearm

origin of semitendinosus

ischial tuberosity

insertion of semitendinosus

medial tibia

action of semitendinosus

flexion of leg; extension of thigh; medial rotation