College Bio Muscles

biceps brachii

flexes forearm

origin: scapula

insertion: radius

deltoid

abducts, flexes, and extends the arm

origin: clavicle/scapula

insertion: humerus

external oblique

Compresses abdomen

origin: ribs

insertion: linea alba

gastrocnemius

extends foot "jumping muscle"

origin: femur

insertion: calcaneus

gluteus maximus

extends thigh "climbing muscle" or the butt

origin: os coxa

insertion: femur

latissimus dorsi

extends arm "swimming muscle"
origin: lumbar vertebrae + os coxa
insertion: humerus

masseter

closes the jaw "chewing muscle"
origin: zygomatic arch
insertion: mandible

orbicularis oris

closes the mouth "kissing muscle"

surrounds the mouth

orbicularis oculi

closes eyelid "winking muscle"

surrounds the eyes

pectoralis major

flexes + abducts arm "hugging muscle"
origin: sternum/clavicle
Insertion: humerus

rectus abdominis

flexes vertebral column, "sit up muscle"
origin: os coxa
insertion: sternum + rib cartilage

sternocleidomastoid

flexes or rotates the head
origin: sternum/clavicle
insertion: mastoid process

tibialis anterior

flexes foot, "shin splints muscle"
origin: tibia
insertion: tarsal and 1st metatarsals

trapezius

draws scapula caudally + medially
origin: thoracic vertebrae
insertion: scapula

triceps brachii

extends forearm, "push-up muscle"
origin: scapula/humerus
insertion: olecranon process of ulna

biceps femoris

extends thigh + flexes lower leg “hamstrings”

origin: os coxa

insertion: fibula

gracilis

adducts thigh

origin: os coxa

insertion: tibia

Quadriceps femoris

flexes thigh + extends lower leg, “kicking muscle”

origin: os coxa

insertion: tibia

sartorius

flexes + latterly rotates thigh

origin: os coxa

insertion: tibia

tensor fasciae latae

flexes, abducts + rotates the thigh

Origin: os coxa

insertion: fascia to the knee