Muscles (All) - Biomed

temporalis

origin: frontal and parietal bone

Insertion: coronoid process of the mandible

Function: elevates mandible

orbicularis oris

origin: maxilla and mandible

insertion: skin of lips

function: closes lips

orbicularis oculi

origin: medial bones for orbit and frontal bone

insertion: circumference of the eye

function: closes eye

zygomaticus major

origin: zygomatic bone

insertion: skin and muscles

function smiling

buccinator

origin: maxilla

insertion: blended with orbicularis oris

function: cheek compression when you whistle

Sternocleidomastoid

origin: sternum and clavicle

insertion: temporal bone

function: rotates and flexes neck

rectus abdominis

origin: pubis

insertion: sternum

function: compress abdomen

transversus abdominis

origin: costal margins- iliac crest

insertion: linea alba and pubic symphysis

function: supports your torso

deepest muscle in your abdomen

external oblique

origin: starts at ribs 5-12

insertion: iliac crest

function: rotates your hips

Internal Oblique

origin: iliac crest

insertion: 10-12 ribs

function: bends your back

serratus anterior

origin: muscle slips from certain ribs

insertion: coracoid process of scapula

function: rotates shoulder anteriorly, assists with inhalation

pectoralis major

origin: clavicle, sternum, cartilage of upper ribs, aponeurosis of external oblique

insertion: greater tubercle of humerus

functions: brings elbows together and helps with adduction of shoulder

scalenes

origin: vertebrae c1-c7

insertion: scalene insertions of the ribs

function: elevates ribs

levator scapulae

origin: vertebrae c1-c4

insertion: medial border

function: elevates scapula

trapezius

origin: vertebrae t1-t4

insertion: lateral third of the clavicle

function: moves shoulder girdle back

internal intercostal

origin: costal grooves of ribs

insertion: superior border of immediate rib below

function: helps with exhaling, supports the thoracic cage

diaphragm

origin: internal surfaces of ribs 7-12, vertebrae L1- L3

function: muscle used for breathing in

Latissimus dorsi

origin: vertebral part: T7-T12, costal part: ribs 9-12, posterior part of iliac crest

insertion: intertubecular part of humerus between pectoralis major and teres major

function: adduction and extension of shoulder joint and arm

deltoid

origin: clavicle, trapezius, acromion

insertion: deltoid tuberosity of the humerus

function: lifts arms at shoulders

teres major

origin: posterior surface of the scapula

insertion: intertubercular of the humerus

function: helps with medial rotation of the shoulder

teres minor

origin: lateral border of dorsal scapular surface

insertion: greater tubercle of humerus

biceps brachii

origin: coracoid process, tubercle above glenoid cavity

insertion: radial tuberosity

function: bicep curl/flexing forearm

triceps brachii

origin: infra glenoid tubercle of scapula, posterior shaft of humerus

insertion: olecranon process of ulna

brachioradialis

origin: lateral supracondular ridge at distal end of humerus

insertion: base of styloid process of radius

function stabilizes elbow during bicep curl motion

sartorius

origin: superior iliac spine

insertion: medial tibia shaft

function: moves back of lower legs back when kneeling

gracilis

origin: ischial ramus, body of pubis

insertion: medial surface of the tibia

function: moves back of lower legs towards buttocks

rectus femoris

origin: anterior inferior iliac spine

insertion: patella tibial tuberosity

function: helps your lower leg kick and rises knee

vastus lateralis

origin greater trochanter, interochanteric, linea aspera on the femur

insertion: patella, tibial tuberosity

function: rises knee and helps lower leg kick

vastus medialis

origin: linea aspera

insertion: patella, tibial tuberosity

function: helps your lower leg and rises knee

vastus intermedius