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Flashcards in endocrine system histo Deck (63)
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1

Responsible for the synthesis and secretion of chemical messenger

endocrine glands

2

composed of islands of secretory cells of epithelial origin derived from any of the 3 primary germ layers.

endocrine glands

3

It has supporting tissues rich in blood and lymphatic capillaries

Ductless glands

endocrine glands

4

Hypophysis cerebri

A specialized appendage of the brain which secretes a variety of hormones.

Pituitary gland

5

is a small, slightly elongated organ buried in the sella turcica and is covered by the diaphragm sellae.

Pituitary gland

6

divides pituitary gland into anterior and posterior

residual lumen of Rathke’s pouch

7

anterior pituitary gland

(adenohypophysis / pars distalis)

8

posterior pituitary gland

(neurohypophysis / pars nervosa)

9

this vestigial cleft divides the anterior pituitary from the pars intermedia.

residual lumen of Rathke’s pouch

10

An extension of the adenohypophysis surrounding the neural stalk

(PARS TUBERALIS.)

11

The anterior pituitary arises from

the RATHKE’S POUCH

12

parts/pars of Anterior lobe :

1) pars distalis
2) pars tuberalis

13

parts Posterior lobe :

1) pars intermedia
2) pars nervosa

14

Located between the pars distalis and pars nervosa

Composed of a thin layer of cells and vesicles containing acidophilic colloidal substance

Parenchymal cells are known as MELANOTROPHES

pars intermedia

15

1) Hormones which act directly on non-endocrine tissues:

a) GH b) prolactin c) ADH d) oxytocin e) MSH

16

Hormones which modulates the secretory activities of other endocrine glands (TROPHIC HORMONES):

a) TSH b) ACTH c) FSH d) LH

17

Hormones which modulates the secretory activities of other endocrine glands

TROPHIC HORMONES

18

-------- may be described as pituitary-dependent endocrine glands

The thyroid, adrenal cortex and gonads

19

WAYS OF CONTROL OF PITUITARY SECRETIONS

Releasing Factors
Feedback Mechanism

20

The anterior lobe constitutes how many percent of the pituitary gland.

75%

21

The parenchyma(pars distalis) is made up of separated from sinusoidal capillaries by a small amount of reticular fibers.

anastomosing cords and clusters of epithelial cells

22

Endocrine organs

1. Pituitary Gland
2. Thyroid Gland
3. Parathyroid gland
4. Adernal Gland
5. Paraganglia
6. Pancreas

23

anterior lobe
made up of secretory cells derived from Rathke's pouch, an embrologic extension of the primitive oral cavity.

adenohypophysis

24

the posterior lobe
is composed of neural tissue; it is a direct extension of the brain, and is attached to the hypothalamus by the pituitary stalk.

neurohypophysis

25

composed of round to polygonal epithelial cells arranged in cords and nests, amid a rich fibrovascular network. These cells release their granules in response to releasing factors elaborated in the hypothalamus.

pars distalis

26

types of parenchymal cells based on staining reactions:

chromophils
chromophobes
gamma cells

27

_____________ techniques can be used to classify the cells by their hormone contents

immunoperoxidase

28

Located between the pars distalis and pars nervosa

Composed of a thin layer of cells and vesicles containing acidophilic colloidal substance

Parenchymal cells are known as MELANOTROPHES

pars intermedia

29

It consists of supporting cells resembling neuroglial cells, the pituicytes and terminal portions of the axons of the supraoptic and paraventricular nuclei of the hypothalamus.

pars nervosa/neurophysis

30

accumulations of neurosecretory materials in nerve terminals.

HERRING BODIES

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