Upper Extremity Skeleton - Skeletal

Stability and Mobility have a ______ relationship

inverse

*more mobile joints —→ decreased stability or higher potential for instability

More secure joints —→ more restrictive in terms of mobility

Main purpose of upper limb is to

position and manipulate the hand

How many numbers of each bone type in the upper limb total:

• Humerus

• radius

• ulna

• carpal bones

• Metacarpals

• phalanges

in total:

• Humerus - 2

• radius - 2

• ulna - 2

• carpal bones - 16

• Metacarpals - 10

• phalanges - 28

What acts as a strut to hold the upper limn in its proper position and to space it away from the trunk of the body

Clavicle; it is usually injured because of a fall onto an outstretched hand

Sternoclavicular joint

joint that unites the axial and appendicular skeletal structures

Scapula

sits in the upper back (shoulder blade).

it helps to form the bony structure of the shoulder

Upper limb consists of:

humerus - arm

ulna - forearm

radius - forearm

carpal bones - wrist

metacarpal bones - palm

phalanges - fingers

_____ is the only bone of the arm

humerus

Olecranon process of the ulna

it hooks into the humerus creating the elbow hinge

Radius = thumb side

Ulna = pinky side

The ulna is ___ at the elbow

Radius can _____ around the unless to create supination and pronation actions

there are ____ carpal bones in the wrist

8 carpal bones in the wist.

They are arranged in 2 rows of 4 bones each.

Carpal tunnel

passageway at the wrist thru which tendons and nerve travel

there are ____ metacarpals in the palm of the hand

5

There are ___ phalanges in each hand (labeled as proximal, middle, and distal)

14

Anatomical name for the thumb is

Pollex

Numbering os the digits

Thumb is digit #1, pinky is digit #5

Thumb has ___ phalanges

2

All other fingers have ___ phalanges each

3

How many phalanges in each finger

• Thumb: 2 phalanges
  (proximal, distal)

• Index finger: 3 phalanges
  (proximal, middle, distal)

• Middle finger: 3 phalanges

• Ring finger: 3 phalanges

• Little finger: 3 phalanges