send short attachments to the retrossal process of the os pedis and to the
inner face of the lateral cartilage.

[Illustration: FIG. 9.--LIGAMENTS OF THE FIRST AND SECOND INTERPHALANGEAL
ARTICULATIONS (VIEWED FROM BEHIND). (AFTER DOLLAR AND WHEATLEY.) 1,
Suspensory ligament; 2, innermost slip from complementary cartilage of
pastern joint; 3, middle slip from complementary cartilage of pastern
joint; 4, outermost slip from complementary cartilage of pastern joint; 5,
glenoid or complementary cartilage of pastern joint; 6, postero-lateral
ligaments of the pedal joint; 7, the navicular bone; 8, interosseous
ligaments of the pedal joint; 9, semilunar crest of os pedis; 10, plantar
surface of os pedis.]

_Synovial Membrane_.--This extends below the facets uniting the navicular
to the pedal bone, and offers for consideration two sacs. A large one
posteriorly running up behind the second phalanx to nearly adjoin the
sesamoidean bursæ, and a small one, a prolongation of the synovial membrane
between the antero-lateral and postero-lateral ligaments of the same side.
This latter is often distended, and on account of its close proximity to
the seat of operation, is liable to be accidentally opened in excision of
the lateral cartilage for quittor.


C. THE TENDONS

In order to convey an intelligent understanding of the tendons it will be
wise to briefly describe the course of their parent muscles from their
commencement.

THE EXTENSOR PEDIS.--The extensor pedis arises from the lower extremity