Chapter 14

EXERCISE 2: WHAT STRUCTURE IS THIS?

Exercise 2 Objective: Teach the user to recognize radiographic anatomy on the normal radiographs of the routine evaluation of the cervical spine hand and wrist.

Exercise type: 2: What Structure is This?

Instruction: User will look at the highlighted structure and identify it from a list of five possibilities.

View: Posteroanterior Hand

What structure is this?

A. sesamoid bones

B. 1^st metacarpal

C. 3^rd metacarpal

D. fif-5^th digit proximal phalanx

E. articular surface of radius

Question Rationale: Sesamoids are a frequent reoccurrence at the metacarpophalangeal and interphalangeal joints of the thumb. The obliques view of the thumb on a posteroanterior view of the hand permits the sesamoids to be easily seen.

What structure is this?

A. sesamoid bones

B. 1^st metacarpal

C. 3^rd metacarpal

D. fif-5^th digit proximal phalanx

E. articular surface of radius

Question Rationale: The metacarpals are numbered 1^st through 5^th, starting with the thumb as the first metacarpal.

What structure is this?

A. sesamoid bones

B. 1^st metacarpal

C. 3^rd metacarpal

D. fif-5^th digit proximal phalanx

E. articular surface of radius

Question Rationale: The digits, or phalanges, are numbered the same as the metacarpals, 1^st through 5^th, starting from the thumb. Each finger has a proximal, a middle, and a distal phalanx.

What structure is this?

A. sesamoid bones

B. 1^st metacarpal

C. 3^rd metacarpal

D. fif-5^th digit proximal phalanx