BIO 201 - Muscular System Practical

Digastric origin:

Mastoid process of temporal bone

Temporalis origin:

Temporal bone

Temporalis actions (2):

1. Elevates mandible

2. Retracts mandible

Masseter origin:

Zygomatic arch

Masseter insertion:

Ramus of mandible

Masseter actions (2):

1. Elevates mandible

2. Protrudes mandible

Temporalis insertion:

Coronoid process of mandible

Deltoid origins (2):

1. Spine of scapula

2. Acromion process of scapula

Deltoid insertion:

Deltoid tuberosity of humerus

Deltoid actions (2):

1. Abducts arm

2. Extend or flex arm

Supraspinatus origin:

Supraspinous fossa of scapula

Supraspinatus insertion:

Greater tubercle of humerus

Supraspinatus action:

Initiates abduction of arm

Infraspinatus origin:

Infraspinous fossa of scapula

Infraspinatus insertion:

Greater tubercle of humerus

Infraspinatus action:

Rotates arm laterally

Teres Minor origin:

Lateral border of scapula

Teres Minor insertion:

Greater tubercle of humerus

Teres Minor actions (2):

1. Adducts arm

2. Extends arm

Subscapularis origin:

Subscapular fossa of scapula

Subscapularis insertion:

Lesser tubercle of humerus

Subscapularis action:

Rotates arm medially

Supraspinatus

Infraspinatus

Teres minor

Subscapularis

Subscapularis

Biceps brachii origin:

Coracoid process of scapula

Biceps brachii insertion:

Radial tuberosity of radius

Biceps brachii actions (2):

1. Flexes supinated forearm

2. Supinates forearm

Biceps brachii

Brachialis action:

Flexes pronated forearm

Brachialis

Triceps brachii origin:

Distal half of humerus

Triceps brachii insertion:

Olecranon process of ulna

Triceps brachii actions (2):

1. Extends forearm

2. Extends arm

Triceps brachii

Pronator teres actions (2):

1. Pronates forearm

2. Flexes forearm

Pronator teres

Orbicularis oculi

Orbicularis oris

Masseter

Flexor carpi radialis actions (2):

1. Flexes hand

2. Abducts hand

Flexor carpi radialis

Flexor carpi ulnaris actions (2):

1. Flexes hand

2. Adducts hand

Flexor carpi ulnaris

Extensor carpi ulnaris actions (2):

1. Extends hand

2. Adducts hand

Extensor carpi ulnaris

Extensor digitorum action:

Extends phalanges

Extensor digitorum

Extensor carpi radialis longus actions (2):

1. Extends hand

2. Abducts hand

Extensor carpi radialis longus

Brachioradialis action:

Flexes semi-pronated forearm

Brachioradialis

Temporalis

Digastric insertion:

Mandible

Digastric action:

Depresses mandible

Digastric

Sternocleidomastoid origin:

Clavicle

Sternocleidomastoid insertion:

Mastoid process of temporal bone

Sternocleidomastoid actions (2):

1. Rotates head

2. Flexes head

Trapezius origins (2):

1. Occipital bone

2. Spinous processes of vertebrae C7-T12

Trapezius insertion:

Spine of scapula

Trapezius actions (2):

1. Elevates scapula

2. Adducts scapula

Rhomboid major origin:

Spinous processes of vertebrae T2-T5

Rhomboid major insertion:

Medial border of scapula

Rhomboid major action:

Adducts scapula

Sternocleidomastoid

Trapezius

Rhomboid major

Latissimus dorsi origin:

Spinous processes of vertebrae T7-sacrum

Latissimus dorsi insertion:

Intertubercular sulcus of humerus

Latissimus dorsi actions (2):

1. Extends arm

2. Adducts arm posteriorly

Latissimus dorsi

Pectoralis major origins (2):

1. Clavicle

2. Sternum

Pectoralis major insertion:

Distal of the greater tubercle of humerus

Pectoralis major actions (2):

1. Flexes arm

2. Adducts arm anteriorly

Pectoralis major

External intercostals

Internal intercostals

Serratus anterior action:

Abducts scapula superiorly

Serratus anterior

Rectus abdominis origin:

Superior ramus of pubis

Rectus abdominis insertion:

Xiphoid process

Rectus abdominis actions (2):

1. Compresses abdomen

2. Flexes vertebral column

Rectus abdominis

External oblique origin:

Ribs 5-12

External oblique insertion:

Linea alba

External oblique actions (2):

1. Compresses abdomen

2. Flexes vertebral column laterally

External oblique

Internal oblique origin:

Inguinal ligament

Internal oblique insertion:

Linea alba

Internal oblique actions (2):

1. Compresses abdomen

2. Flexes vertebral column laterally

Internal oblique

Diaphragm

Linea alba

Inguinal ligament

Thoracolumbar fascia

Gluteus maximus insertion:

Gluteal tuberosity of femur

Gluteus maximus actions (2):

1. Extends thigh

2. Rotates thigh laterally