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Electron microscopic examination reveals branching smooth muscle cells in human testicular capsules, indicating their role in spontaneous contractions for sperm transport.
Electron micrographs of human testicular capsule reveal large numbers of branching smooth muscle cells coursing through collagenous tissue of the tunica albuginea. These cells have subcellular morphology characteristic of smooth muscle cells, and they associate with one another through areas of close contact. These are the contractile cells responsible for spontaneous contractions of the human testicular capsule-contractions that may be important in transporting nonmotile sperm out of the testis.
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Langford et al. (1973) studied this question.
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