Anatomy muscles - Insertion, Origin, Function

Biceps Brachii

Origin: Scapula

Insertion: Radius

Flexes elbow, supinates

Triceps brachii

Origin: shoulder girdle and humerus

Insertion: ulna

extends elbow

Trapezius

Origin: Occipital and cervical + thoracic vertebrae

Insertion: scapular spine and clavicle

extends neck, adducts scapula

Deltoid

Origin: Scapular spine and clavicle

Insertion: Humerus

abducts humerus

Pectoralis major

origin: Sternum, clavicle, ribs 1-6

insertion: humerus

adducts humerus, flexes humerus

rectus abdominus

Origin: pubis

insertion: sternum, lower 8 ribs

flexes vertebral column, compress abdomen

Sternocleidomastoid

origin: sternum, clavicle

insertion: temporal bone

flex neck, rotate head

external oblique

origin: lower 8 ribs

insertion: iliac crest

flexes vertebral column

internal oblique

origin: iliac crest

insertion: lower 8 ribs

flexes vertebral column

Quadriceps

Origin: femur

insertion: tibia

extends knee

Latissimus dorsi

origin: lower spine, iliac crest

insertion: humerus

extends and adducts humerus

Gluteus maximus

origin: sacrum, ilium

insertion: femur

extends hip

Gluteus medius

Origin: Ilium

insertion: femur

adducts thigh

Gastrocnemius

origin: femur

insertion: calcaneus

plantar flexes foot, flexes knee