A&p Ch 7 Part 3

Front 1

Thoracic Cage

• Composed of

Back 1

– Thoracic vertebrae posteriorly

– Sternum and costal cartilages anteriorly

– Ribs laterally

Front 2

Thoracic Cage

functions

Back 2

– Protects vital organs of thoracic cavity

– Supports shoulder girdles and upper limbs

– Provides attachment sites for muscles of

neck, back, chest, and shoulders

Front 3

Ribs 1-7

Back 3

True Ribs

Front 4

Ribs 8-12

Back 4

False ribs

Front 5

Floating ribs

Back 5

#11 and 12

Front 6

Components of thoracic cage:

Back 6

Ribs: True(1-7), False(9-12), Floating(11-12)

Jugular notch

Clavicular notch

Manubrium

Sternal angle

Body

Xiphisternal joint

Xiphoid

Sternum

Intercostal

spaces

Costal cartilage

Costal margin

process

Front 7

components of sternum

Back 7

-Manubrium

-Sternal Angle

-xiphesternal joint

-Xiphoid process

Front 8

–Pectoral girdle function

Back 8

• Attaches upper limbs to body trunk

Front 9

Pelvic girdle

Back 9

• Attaches lower limbs to body trunk,

designed to be weight bearing

Front 10

Pectoral girdle consists of:

Back 10

1 clavicle & 1 scapula

Front 11

Clavicles and scapulae functions and characteristics

Back 11

– Attach upper limbs to axial skeleton

– Provide attachment sites for muscles that

move upper limbs

– allows for maximum movement, but reduces

stability, maximum mobility not seen anywhere else

Front 12

Sternoclavicular joints

Back 12

: only attachment points of the pectoral girdle to the axial skeleton

Front 13

Clavicle function

Back 13

(collarbone): act as braces to hold

the scapula and arms out laterally

Front 14

Scapula: articulates with

Back 14

clavicles & with humerus bones of upper arm

– Scapulae (pl.) or shoulder blades

Front 15

The Upper Limb

• 30 bones

Back 15

= skeletal framework of upper limb

– Arm

• Humerus

– Forearm

• Radius and ulna

– Hand

• 8 carpal bones in the wrist

• 5 metacarpal bones in the palm

• 14 phalanges in the fingers

Front 16

Ulna

Back 16

– Medial bone in forearm

– Forms major portion of elbow joint with

humerus

Front 17

Radius

Back 17

– Lateral bone in forearm

– Head articulates with capitulum of humerus

and radial notch of ulna

Front 18

Connects radius and ulna

Back 18

Interosseous membrane connects radius and

ulna along their entire length

Front 19

Carpus (Wrist)

Back 19

– Eight bones in two rows

Front 20

Proximal row of carpus—lateral to medial

Back 20

– Scaphoid, lunate, triquetrum, and pisiform

Front 21

Distal row of carpus—lateral to medial

Back 21

– Trapezium, trapezoid, capitate, and hamate

Front 22

Form wrist joint:

Back 22

Only scaphoid, lunate, and triquetrum form

wrist joint which radius is involved more than

ulna

Front 23

Elbow joint

Back 23

Ulna is major player in the formation of the

elbow joint

Front 24

Metacarpus (Palm)

Back 24

– Five metacarpal bones (#1 to #5 from thumb

to little finger) form the palm

Front 25

Phalanges (Fingers)

Back 25

– Fingers numbered 1–starting at thumb (pollex)

– Digit #1 (Pollex) has 2 bones - no middle phalanx

– Digits #2 – 5 have 3 bones—distal, middle,

and proximal phalanx