The Axial Skeleton Pt. 2 (The Spine, Ribcage, and Sacrum)

Topic 4 Lesson 3 NurseHub

Thoracic Cage

ribs and sternum

ribs (count):

12

12 pairs of ribs:

(7 pairs true ribs), (5 pairs false ribs)

what are true ribs

attached to the sternum by costal cartilages

what are false ribs

not directly attached to the sternum

false ribs diversify further into:

floating ribs

which ribs are floating ribs

11-12

floating ribs

lack costal cartilage

other false ribs (not floating) #'s?

8 9 10

8 9 10 false ribs:

not directly attached to the sternum, their cartilage fuses with costal cartilage of 7

how are the 8,9,10 false ribs supported if they are not attached to sternum?

their cartilage fuses with costal cartilage of 7

Sternum has __ parts

3

3 parts of sternum:

manubrium, body, xiphoid process

clavicular notch

Site where manubrium articulates with the clavicles

sternum pic

bony ossicles of middle ear function

Connect external ear to internal ear: amplifies sound waves

name the bony ossicles of middle ear

malleus, incus, stapes

Pectoral girdle

Clavicle and scapula

Pectoral girdle function

attaches upper limb to the trunk

upper limb

arms

Pelvic girdle

made up of coxal bones (pelvis)

how many coxal bones?

2 coxal bones, 1 on each side

pelvis is made up of

fusion of 3 bones: ilium, ischium, pubis

function of the pelvic girdle:

attaches lower limbs to the trunk