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AP Muscles OI
AP Origin, Insertion, and Function of Muscles
20
Anatomy
04/10/2010
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Term
Zygomatic Major
 Definition
Origin: Zygomatic Bone

Insertion: Corner of Mouth

Function: Draws corner of mouth upward and outward
Term
Buccinator
 Definition
Origin: Maxilla, Mandible

Insertion: Orbicularis Oris

Function: Whistling, Blowing, Sucking, Chewing
Term
Mentalis
 Definition
Origin: Mandible

Insertion: Skin of chin

Function: Elevates and protrudes lower lip
Term
Masseter
 Definition
Origin: Zygomatic arch and maxilla

Insertion: Angle of mandible

Function: Raises Mandible and Draws it Forward
Term
Styloglossus
 Definition
Origin: Styloid process of temporal bone

Insertion: Undersurface of tongue and hyoid bone

Function: Raises and draws tongue backward (retraction)
Term
Sternocleidomastoid
 Definition
Origin: sternum and clavicle

Insertion: mastoid process of the temporal bone

Function: Flexes neck on chest, rotates face toward opposite side
Term
Rectus Abdominus
 Definition
Origin: Pubis

Insertion: Costal cartilage of ribs 5-7, xiphoid process.

Function: Flexes trunk; compresses abdominal contents
Term
External Oblique
 Definition
Origin: Ribs 5-12

Insertion: Iliac crest and linea alba

Function: Compress abdomen, flexes and rotates vertebral column (same as internal oblique)
Term
Internal Oblique
 Definition
Origin: Upper Pelvic Area

Insertion: Linea alba, cartilage of ribs 7-10

Function: Compress abdomen, flexes and rotates vertebral column (same as external oblique)
Term
Trapezius
 Definition
Origin: spine, cervical thoraic vertabrae

Insertion: clavicle, acromion, and spine of scapula

Function: Extends head, elevates scapula
Term
Latissimus Dorsi
 Definition
Origin: vertabrae

Insertion: the humerus

Function: Adducts, extends and rotates arm medially, depresses shoulder
Term
Pectoralis Major
 Definition
Origin: Clavicular head, Sternum

Insertion: intertubercular groove of the humerus

Function: Adducts, flexes, and rotates arm medially
Term
Deltoid
 Definition
Origin: clavicle, acromion, spine of the scapula

Insertion: deltoid tuberosity of humerus

Function: Abducts arm
Term
Biceps Brachii
 Definition
Origin: coracoid process of the scapula, supraglenoid tubercle

Insertion: radial tuberosity and bicipital aponeurosis

Function: Flexes and supinates arm
Term
Triceps Brachii
 Definition
Origin: infraglenoid tubercle of scapula, posterior humerus

Insertion: olecranon process of ulna

Function: Extends forearm
Term
Sartorius
 Definition
Origin: pelvic area

Insertion: anteromedial surface of the upper tibia

Function: Flexes thigh and knee
Term
Gracilis
 Definition
Origin: pelvic area

Insertion: tibia

Function: Adducts thigh, flexes knee
Term
Rectus Femoris
 Definition
Origin: anterior inferior iliac spine

Insertion: The knee

Function: Extends knee, flexes thigh
Term
Biceps Femoris
 Definition
Origin: femur

Insertion: the head of the fibula which articulates with the back of the lateral tibial condyle

Function: Flexes knee, extends thigh
Term
Gastrocnemius
 Definition
Origin: medial condyles of femur

Insertion: achilles tendon into mid-posteior calcaneus

Function: Plantar flexes foot