a&p practical 2 functions and I/O's

Masseter Function

jaw closer

Mylohyoid Function

Elevates hyoid bone

Digastric Function

depresses mandible

Sternohyoid Function

 depresses larynx if the mandible is fixed 

Sternothyroid Function

depresses larynx if the mandible is fixed 

Sternocleidomastoid Function

 flexion of the neck

Sternocleidomastoid Insertion

Mastoid Process

Sternocleidomastoid Origin

Sternum and clavicle

Pectoralis major Function

Rotates arm

Pectoralis major Insertion

Humerus

Pectoralis major Origin

Clavicle and Sternum

Pectoralis minor Function

Draws scapula forward

Pectoralis minor Insertion

Coracoid process

Pectoralis minor Origin

Anterior surface of ribs 3-5

Scalenes Function

Elevates ribs 1-2

Serratus Function

Rotates and holds scapula

Trapezius Muscles Function

Raises scapula

Trapezius Muscles Origin

Occipital Bone and spinous process C7-T12

Trapezius Muscles Insertion

Clavicle and scapula

Deltoid Muscles Function

Holds and rotates scapula

Deltoid Muscles Origin

Clavicle and scapula

Deltoid Muscles Insertion

deltoid tuberosity

Levator scapulae Function

Elevates scapula

Supraspinatus function

Initiates abduction of arm

Infraspinatus function

lateral rotation of arm

Splenius function

Extends head

Subscapularis function

 Adduction of the humerus

Rhomboideus Muscles function

stabilize scapula

Latissimus dorsi Function

Arm extension

Latissimus dorsi Origin

Spinous process of T10 sacral vertebrae

Latissimus dorsi Insertion

Humerus

Erector spinae function

Extends vertebral column

Teres Major function

Adducts arm

Teres minor function

lateral rotation of arm

Triceps brachii Muscles Function

Powerful forearm extensor

Triceps brachii Muscles Origin

Glenoid cavity and humerus

Triceps brachii Muscles Insertion

Ulna

Brachialis function

Flexor of forearm

 Biceps brachii Function

Forearm flexation

 Biceps brachii Origin

scapula

 Biceps brachii Insertion

Radius

Brachioradialis Function

Synergist in forearm flexion

Extensor carpi radialis longus Function

Extends and abducts hand

Extensor carpi radialis brevis Function

Extends and abducts hand

Extensor digitorum muscles Function

Finger extension 

Extensor carpi ulnaris Function

Extends and adducts hand 

Flexor carpi ulnaris Function

Flexes and adducts hand

Palmaris longus function

Tenses skin of palm

Flexor carpi radialis Function

flexor and abductor of the hand

 Pronator teres function

pronates forearm

Rectus abdominis Function

Flexes and rotates vertebral column

Rectus abdominis Origin

Pubic crest

Rectus abdominis Insertion

Xiphoid process and ribs 5-7 

Linea alba Function

 Keeps the right and left abdominal muscles separated

External oblique function

Rotates abdominal wall

Internal oblique Function

Rotates abdominal wall  

Transverse abdominis function

Compresses abdominal contents

Tensor fasciae latae function

powerful thigh extensor 

Gluteus medius function

medially rotates thigh

Gluteus maximus function

 Powerful thigh extensor 

Sartorius function

laterally rotates thigh

Gracilis Function

Flexes leg

Quadricep Muscles Function

Stabilizes Knee

Quadricep Muscles Origin

anterior pelvis and femur

Quadricep Muscles Insertion

 Tibial tuberosity

Hamstring Muscles Function

extends thigh

Hamstring Muscles Origin

Ischial tuberosity

Hamstring Muscles Insertion

Posterior tibia

Adductors Function

 Adducts thigh

Pectineus Function

Adducts thigh 

Iliopsoas Function

Flexes trunk of hip joint

Gastrocnemius Function

Plantar flexes foot

Soleus Function

Plantar flexion

Plantaris function

Assists in plantar flexion of the foot

 Tibialis anterior Function

dorsiflexion

 Tibialis anterior Origin

Tibia

 Tibialis anterior Insertion

metatarsal 1 

Fibularis Muscles Function

Everts Foot

 Extensor digitorum longus Function

toe extension

 Flexor digitorum longus function

Flexes toes

Tibialis posterior Function

Foot inversion