Anatomy of the Cat

by Jacob Reighard; H. S. Jennings

D. Special Muscles of the Second Digit (the Index).

—M. flexor brevis digiti secundi (or indicis).—This name may be applied to M. interosseus of the second digit ([Fig. 89], c).

M. abductor digiti secundi.—This name might be applied to a portion of the interosseus of the second digit which is sometimes differentiated from the remainder.

Origin from the radial and ventral surfaces of the base of the second metacarpal, and from the ventral surface of the trapezium.

Insertion into the radial side of the base of the first phalanx of the second digit and into its sesamoid.

M. adductor digiti secundi ([Fig. 89], d).

Origin from the ventral surface of the os magnum.

Insertion into the ulnar side of the base of the first phalanx of the second digit.

E. Special Muscles of the Fifth Digit.

—M. abductor digiti quinti ([Fig. 89], i).—A thick, small, conical bundle.