Archive image from page 30 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 THE OVUM 19 The number of spermatozoa produced during the lifetime of a single individual is very large. It has been found that 1 cu. mm. of human ejaculate contains 60,876 spermatozoa, a single ejaculate, therefore, containing over 200,000,000. This would indicate that during his lifetime a man may produce 340 billion spermatozoa (Lode). The Ovum.—The human ovum is a spherical cell measuring about mm. in diameter and is contained
Archive image from page 30 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 THE OVUM 19 The number of spermatozoa produced during the lifetime of a single individual is very large. It has been found that 1 cu. mm. of human ejaculate contains 60,876 spermatozoa, a single ejaculate, therefore, containing over 200,000,000. This would indicate that during his lifetime a man may produce 340 billion spermatozoa (Lode). The Ovum.—The human ovum is a spherical cell measuring about mm. in diameter and is contained within a cavity situated -dp .0 mgr—— Fig. 10.—Section through Portion of an Ovary of an Opossum {Didephys vir- giniana) showing Ova and Follicles in Various Stages of Development. b, Blood-vessel; dp, discus proligerus; mg, stratum granulosum; o, ovum; s, stroma; th, theca folliculi. near or at the surface of the ovary and termed a Graafian follicle. This follicle is surrounded by a capsule composed of two layers, an outer one, the theca externa, consisting of fibrous tissue resembling that found in the ovarian stroma, and an inner one, the theca interna, composed of numerous spherical and fusiform cells. Both the
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