Appendicular Skeleton: Upper Limb Flashcards Preview

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Flashcards in Appendicular Skeleton: Upper Limb Deck (7)
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1

How many bones are in the Upper limb? What the the 3 divisions?

30 bones

Divides into:
--arm (upper arm/brachium): humerus
--forearm (antebrachium): radius and ulna
--hand (includes wrist): 27 bones (carpals, metacarpals, phalanges)

2

Humerus

Largest and longest bone of upper limb
Head articulates w/ scapula at glenoid cavity
Distal end articles w/ radius and ulna (elbow)
Greater and lesser tubercles are sites of attachment; deltoid tuberosity is attachment for deltoid muscle

3

Where does the humerus most frequently fracture?

at the surgical neck

4

Fractures of the Humerus

Commonly occur in 2 places:
--surgical neck
--midshaft spiral fractures

Nerves pass along bone and can be damaged by these 2 fractures. MAY lead to permanent upper limb dysfunction

5

Distal Humerus and Elbow (anterior view)

Ulna and Radius articulate w/ humerus
Ulna is main forearm bone contributing to elbow
Trochlea of humerus articulates w/ trochlear notch of ulna. Trochlear notch fits over trochlea to create a hinge
Coronoid fossa receives coronoid process when forearm bends

6

Distal Humerus and Elbow (posterior view)

Olecranon fossa of humerus receives olecranon process of ulna when forearm extends
Lateral and medial epicondyles on humerus are attachment site for forearm muscles

7

Distal Humerus/Articulations

Capitulum of distal humerus articulates w/ head of radius
Radial head ALSO articulates w/ radial notch of ulna (proximal radioulnar joint) to form a pivot joint
Elbow can bend or forearm can twist