A&P Lab VIII

True ribs (1-7)

false ribs (8-12)

floating ribs (11-12)

head of rib

neck of rib

tubercle (of rib)

angle (of rib)

shaft (rib)

manubrium

body of sternum

xiphoid process

levator scapulae

O: transverse processes of C1-C4 vertebrae

I: medial border of scapula

A: elevates & abducts scapula

pectoralis major

O: clavicle, sternum and cartilage of 2-6 rib

I: greater tubercle of humerus

A: flexes, adducts, and rotates arm medially

pectoralis minor

O: 3-5 ribs

I: coracoid process of scapula

A: depresses scapula

serratus anterior

O: upper edge of 1st 8 ribs

I: costal surface of scapula

A: pulls scapula forward

external intercostals

internal intercostals

diaphragm

Trapezius

O: spinous process of thoracic vertebrae, occipital bone, ligamentum nuchae

I: clavicle, spine & acromion processes of scapula

A: raises clavicle

latissimus dorsi

O: spines of thoracic & lumbar vertebrae, crests of sacrum & iliac crest & last 4 ribs

I: intertubercular groove of humerus

A: adducts upper arm posteriorly

rhomboid major

O: spines of 1-4 thoracic vertebrae

I: medial border of scapula

A: retracts & rotates scapula

rhomboid minor

O: spines of 6&7 cervical vertebrae

I: superior angle, medial border of scapula

A: adducts scapula

Supraspinatus

O: supraspinous fossa of scapula

I: greater tubercle of humerus

A: initiates abduction of humerus

infraspinatus

O: infraspinous border of scapula

I: greater tubercle on humerus

A: rotates arm outward

teres major

O: inferior angle of scapula

I: proximal end of humerus

A: extends humerus, adducts & medial rotation of arm

teres minor

rectus abdominis

O: pubic symphysis & pubic crest

I: xiphoid process & costal cartilage of 5-7 ribs

A: compresses abdomen

external oblique

O: lower 8 ribs

I: iliac crest & pubis by inguinal ligament & linea alba by aponeurosis

A: compresses abdomen

internal oblique

O: iliac crest & lumbodorsal fascia

I: costal cartilage of last 3 ribs & linea alba

A: flex vertebral column to compress abdomen

transversus abdominis

linea alba

deep transverse perineal

superficial transverse perineal