6.2 POJA-L2700+2701+2703
+3830+3347.
Spermatozoa in ejaculates
6.2 POJA-L2700+2701+2703+3830+3347
Title: Spermatozoa in ejaculates
Description:
(A) Phase contrast, human. (B-E) Electron microscopy, human.
(A): Shows the phase contrast picture of ejaculated sperm with a light head and a long thin tail.
(B-E): The electron microscopy scheme of a spermatozoon with cross-sections at different levels from head to tail.
The head region (B, 1) comprises the dark, condensed nucleus with a light nuclear vesicle detailed in (D, 1v).
The nucleus is covered with an acrosome cap, detailed in (D, 1ac).
(B, 2): Neck region comprises a small residual cytoplasmic sac.
It is also the place where the flagellum starts just below the base of the nucleus. The flagellum, derived from the distal centriole
(9x2 + 2 structure), detailed in (E), consists of nine peripheral double tubules (E, 7) and two central tubules.
The transition from the mitochondrial zone to principal tail part is called the annulus.
The middle piece (B, 3) contains helically arranged sheath of mitochondria needed for the energy production (see also in C).
(B, 4+5): The spermatozoal principal piece is the tail with axoneme surrounded by a fibrous sheath.
(B, 6): End piece. (C) Head and neck of a spermatozoon.
(D): Detail of the head. (D, 1ac) acrosome cap. (D, 1v) Nuclear vesicle.
(E, 8): Detail of principle piece as shown in (B, 4).
Keywords/Mesh: testis, sperm, spermatozoon, acrosome, histology, electron microscopy, POJA collection
Title: Spermatozoa in ejaculates
Description:
(A) Phase contrast, human. (B-E) Electron microscopy, human.
(A): Shows the phase contrast picture of ejaculated sperm with a light head and a long thin tail.
(B-E): The electron microscopy scheme of a spermatozoon with cross-sections at different levels from head to tail.
The head region (B, 1) comprises the dark, condensed nucleus with a light nuclear vesicle detailed in (D, 1v).
The nucleus is covered with an acrosome cap, detailed in (D, 1ac).
(B, 2): Neck region comprises a small residual cytoplasmic sac.
It is also the place where the flagellum starts just below the base of the nucleus. The flagellum, derived from the distal centriole
(9x2 + 2 structure), detailed in (E), consists of nine peripheral double tubules (E, 7) and two central tubules.
The transition from the mitochondrial zone to principal tail part is called the annulus.
The middle piece (B, 3) contains helically arranged sheath of mitochondria needed for the energy production (see also in C).
(B, 4+5): The spermatozoal principal piece is the tail with axoneme surrounded by a fibrous sheath.
(B, 6): End piece. (C) Head and neck of a spermatozoon.
(D): Detail of the head. (D, 1ac) acrosome cap. (D, 1v) Nuclear vesicle.
(E, 8): Detail of principle piece as shown in (B, 4).
Keywords/Mesh: testis, sperm, spermatozoon, acrosome, histology, electron microscopy, POJA collection