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25 Cards in this Set

  • Front
  • Back

Thoracic Cage


• Composed of


– Thoracic vertebrae posteriorly


– Sternum and costal cartilages anteriorly


– Ribs laterally

Thoracic Cage


functions

– Protects vital organs of thoracic cavity


– Supports shoulder girdles and upper limbs


– Provides attachment sites for muscles of


neck, back, chest, and shoulders

Ribs 1-7

True Ribs

Ribs 8-12

False ribs

Floating ribs

#11 and 12


Components of thoracic cage:

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

components of sternum

-Manubrium


-Sternal Angle


-xiphesternal joint


-Xiphoid process

–Pectoral girdle function


• Attaches upper limbs to body trunk

Pelvic girdle



• Attaches lower limbs to body trunk,


designed to be weight bearing

Pectoral girdle consists of:

1 clavicle & 1 scapula

Clavicles and scapulae functions and characteristics


– 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

Sternoclavicular joints

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

Clavicle function

(collarbone): act as braces to hold


the scapula and arms out laterally

Scapula: articulates with

clavicles & with humerus bones of upper arm


– Scapulae (pl.) or shoulder blades

The Upper Limb


• 30 bones

= 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

Ulna


– Medial bone in forearm


– Forms major portion of elbow joint with


humerus

Radius



– Lateral bone in forearm


– Head articulates with capitulum of humerus


and radial notch of ulna


Connects radius and ulna

Interosseous membrane connects radius and


ulna along their entire length

Carpus (Wrist)


– Eight bones in two rows

Proximal row of carpus—lateral to medial


Scaphoid, lunate, triquetrum, and pisiform

Distal row of carpus—lateral to medial



Trapezium, trapezoid, capitate, and hamate

Form wrist joint:

Only scaphoid, lunate, and triquetrum form


wrist joint which radius is involved more than


ulna

Elbow joint

Ulna is major player in the formation of the


elbow joint

Metacarpus (Palm)


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


to little finger) form the palm

Phalanges (Fingers)



– 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