The vascular lacuna is the medial compartment beneath the inguinal ligament

Inguinal ligament

The inguinal ligament is a band running from the pubic tubercle to the anterior superior iliac spine. Its anatomy is very important for operating on hernia patients.-Anatomy:...

, for the passage to the femoral vessels, lymph node, and femoral branch of the genitofemoral nerve

Genitofemoral nerve

In human anatomy, the genitofemoral nerve originates from the upper part of the lumbar plexus of spinal nerves. Its roots are L1 and L2 .The genitofemoral nerve is responsible for both the efferent and afferent limbs of the cremasteric reflex...

. Medial to lateral these are the: Rosenmuller lymph node, femoral vein, femoral artery, and gem oral branch of genitofemoral nerve. It is separated from the muscular lacuna

Muscular lacuna

The Muscular lacuna is the lateral compartment beneath the inguinal ligament, for the passage of the iliopsoas muscle and femoral nerve; it is separated by the iliopectineal arch from the vascular lacuna....

 by the iliopectineal arch

Iliopectineal arch

The Iliopectineal arch is a thickened band of fused iliac fascia and psoas fascia passing from the posterior aspect of the inguinal ligament anteriorly across the front of the femoral nerve to attach to the iliopubic eminence of the hip bone posteriorly...

. It's boundaries are therefore the iliopectineal arch, the inguinal ligament, lacunar ligament

Lacunar ligament

The lacunar ligament is a ligament in the inguinal region that connects the inguinal ligament to the pectineal ligament near the point where they both insert on the pubic tubercle.-Anatomy:...

and superior border of the pubis. The lacunar ligament can be a site of entrapment for femoral hernias.