
Testis proper: endocrine portion
Leydig (interstitial) cells are located in the tissue between the convoluted portions of the seminiferous tubules and constitute the endocrine portion of the testis. They secrete testosterone under the influence of luteinizing hormone from the pars distalis of the pituitary gland. Blood vessels and lymphatics are abundant in the interstitium surrounding these cells. 400x

Seminiferous tubules
Leydig (interstitial) cells are located in the tissue between the convoluted portions of the seminiferous tubules and constitute the endocrine portion of the testis. They secrete testosterone under the influence of luteinizing hormone from the pars distalis of the pituitary gland. Blood vessels and lymphatics are abundant in the interstitium surrounding these cells. 400x

Leydig (interstitial) cells
Leydig (interstitial) cells are located in the tissue between the convoluted portions of the seminiferous tubules and constitute the endocrine portion of the testis. They secrete testosterone under the influence of luteinizing hormone from the pars distalis of the pituitary gland. Blood vessels and lymphatics are abundant in the interstitium surrounding these cells. 400x

Tunica propria
Leydig (interstitial) cells are located in the tissue between the convoluted portions of the seminiferous tubules and constitute the endocrine portion of the testis. They secrete testosterone under the influence of luteinizing hormone from the pars distalis of the pituitary gland. Blood vessels and lymphatics are abundant in the interstitium surrounding these cells. 400x

Blood vessels
Leydig (interstitial) cells are located in the tissue between the convoluted portions of the seminiferous tubules and constitute the endocrine portion of the testis. They secrete testosterone under the influence of luteinizing hormone from the pars distalis of the pituitary gland. Blood vessels and lymphatics are abundant in the interstitium surrounding these cells. 400x

Image source >
Images take of a slide from the University of New England College of Osteopathic Medicine slide collection.