Kinesiology Lab 0- Muscles

Serratus Anterior Origin

Ribs 1-8 lateral surface

Serratus Anterior Insertion

Medial border of scapula

Serratus Anterior Action

• scapular protraction

• lateral rotation

Trapezius Origin

upper: ligamentum nuchae

middle: C7-T4

lower: T4-T12

Trapezius insertion (same as deltoid)

lateral third of clavicle, acromion process, and spine of scapula

Trapezius action

• scapular elevation

• scapular retraction

• scapular depression

Rhomboid Major origin

T2-T5 spinous process

Rhomboid major insertion

medial border of scapula

Rhomboid major action

scapular retraction

Pectoralis Minor origin

Ribs 3-5 anterior surface

Pectoralis minor insertion

coracoid process of scapula

pectoralis minor action

scapular depression and downward rotation

deltoid origin

anterior: 1/3 lateral clavicle

posterior: acromion and spine of scapula

deltoid insertion

deltoid tuberosity

deltoid action

anterior- flexion middle- abduction posterior- GH extension

supraspinatus origin

supraspinous fossa of scapula

supraspinatus insertion

greater tuberosity of humerus

supraspinatus action

GH abduction, compression/stabilization of humeral head into glenoid fossa

infraspinatus origin

infraspinious fossa of scapula

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

GH external rotation, compression/stabilization of humeral head into glenoid fossa

teres minor origin

lateral scapular border

teres minor insertion

greater tubercle of the humerus

teres minor action

GH external rotation, compression/stabilization of humeral head into glenoid fossa

subscapularis origin

subscapular fossa of scapula

subscapularis insertion

lesser tubercle of the humerus

subscapularis action

GH internal rotation, compression/stabilization of humeral head into glenoid fossa

teres major origin

inferior angle, posterior/lateral scapular surface

teres major insertion

lesser tubercle

teres major action

GH internal rotation and adduction

Biceps brachii origin

long- supraglenoid tubercle

short: coracoid process

biceps brachii insertion

radial tuberosity of the radius

biceps brachii action

GH flexion, elbow flexion, forearm supination

Triceps brachii

long- infraglenoid tubercle

lateral- posterior surface humerus

medial- posterior surface humerus

triceps brachii insertion

olecranon process

triceps brachii action

GH extension (long head), elbow extension (all 3 heads)

Latissimus dorsi origin

T7-T12, ribs 9-12, lumbar and scral vertebrae, posterior third of the external lip of iliac crest

latissimus dorsi insertion

intertubercular sulcus floor of bicipital groove lat

latissimus dorsi action

GH extension, adduction and internal rotation

Pectoralis major origin

sternal head- lateral aspects of manubrium and body of sternum

clavicular head- anterior surface of the medial half of the clavicle

pectoralis major insertion

lateral intertubercular sulcus of the humerus (greater tubercle of the humerus)

pectoralis major action

GH adduction, horizontal adduction, internal rotation

brachialis origin

humeral bone

brachialis insertion

ulnar tuberosity and coronoid process

brachialis action

elbow flexion in all radial forearm positions

brachioradialis origin

lateral supracondylar ridge of humerus

brachioradialis insertion

styloid process on radius

brachioradialis action

elbow flexion, greatest in neutral forearm pronation/supination

pronator teres origin

humerus medial epicondyle, ulna coronoid process

pronator teres insertion

lateral surface of shaft of radius

pronator teres action

forearm pronation, elbow flexion (weak)

supinator origin

lateral epicondyle of humerus

supinator insertion

proximal part of the anterolateral surface of radius

supinator action

forearm supination

extensor digitorum origin

lateral epicondyle

extensor digitorum insertion

extensor apparatus of medial four fingers

extensor digitorum action

wrist extension, extends digits 2-5 at the MCP, PIP, and DIP joints

pronator quadratus origin

distal ¼ of anteromedial surface of ulna p

pronator quadratus insertion

distal ¼ of anterolateral surface of radius

pronator quadratus action

forearm pronation

Flexor Digitorum Profundus origin

anteromedial surface of superior ¾ ulna

flexor digitorum profundus insertion

volar surface of distal phalanx of 4th digit

flexor digitorum profundus action

wrist flexion, digits 2-5 PIP DIP flexion

flexor digitorum superficialis origin

medial epicondyle of humerus (via the common flexor tendon)

flexor digitorum superficialis insertion

proximal middle phalanges digits 2-5

flexor digitorum superficialis action

wrist flexion, digits 2-5 MCP and PIP flexion

lumbricals origin

tendon of flexor digitorum profundus

lumbricals insertion

extensor hood/mechanism of same digits as the tendon of origin

lumbricals actions

flex MCP, extend PIP and DIP

Gluteus maximus origin

posterior ilium, sacrum and coccyx

gluteus maximus insertion

gluteal tuberosity, IT tract

gluteus maximus action

extension of the thigh, external rotation of the thigh at the hip

gluteus medius origin

outer surface of ilium

gluteus medius insertion

greater trochanter

gluteus medius action

hip abduction, internal rotations

gluteus minimus origin

outer surface of ilium

gluteus minimus insertion

greater trochanter

gluteus minimus action

abduction, aassist with internal rotation

piriformis origin

anterior sacrum

piriformis insertion

greater trochanter

piriformis action

external rotations

sartorius origin

ASIS

sartorius insertion

medial tibial condyle

sartorius action

hip flexion, knee flexion

iliopsoas origin

iliacus- t12-L4

soas- iliac foss, iliac crest

iliopsoas insertion

lesser trochanter

iliopsoas action

flex hip and slight external rotation

adductor magnus origin

pubis (inferior ramus)

adductor magnus insertion

linea aspera, adductor tubercle

adductor magnus action

adduction, extension and internal rotation of hip

adductor longus origin

pubis (inferior ramus)

adductor longus insertion

linea aspera

adductor longus action

hip adduction, internal rotation

Gracilis origin

inferior ischiopubic ramus and body of pubis

gracilis insertion

medial tibia at the pes anserinus

gracilis action

hip adduction, knee flexion, tibial internal rotation

rectus femoris origin

AIIS

rectus femoris insertion

patella→ tibial tuberosity via patellar tendon/ligament

rectus femoris action

hip flexion, knee extension (only quadriceps muscle that crosses hip joint)

vastus lateralis origin

greater trochanter