The tunica vasculosa testis (vascular layer of testis) is the inner-most of the three layers that form the capsule of the

testis A testicle or testis ( testes) is the gonad in all male bilaterians, including humans, and is Homology (biology), homologous to the ovary in females. Its primary functions are the production of sperm and the secretion of Androgen, androgens, p ...

. It consists of a vascular plexus and

loose connective tissue Loose connective tissue, also known as areolar tissue, is a cellular connective tissue with thin and relatively sparse collagen fibers. They have a semi-fluid matrix with lesser proportions of fibers. Its ground substance occupies more vol ...

. It extends into the testis itself to line the surfaces of individual septa of testis.

References

Mammal male reproductive system {{Portal bar, Anatomy