The vasal injection is given deep to external spermatic fascia
, but superficial to internal spermatic fascia which encloses testicular arteries and veins.
The scrotal wall consists of the following layers (from superficial to deep): skin, superficial fascia, dartos muscle, external spermatic fascia
, cremasteric fascia, and internal spermatic fascia.
As shown in Figure 1, these layers include the skin, superficial scrotal fascia, external spermatic fascia
, cremaster muscle, and internal spermatic fascia.