Covers the thyroid gland's position, shape, lobes and isthmus, capsules, surrounding structures, nerve supply, follicular and parafollicular histology, and its arterial, venous and lymphatic drainage. Also describes the four parathyroid glands, their superior and inferior types with a comparison table, chief and oxyphil cell histology, and parathyroid hormone's role in calcium and phosphorus control.
Topic 85 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 12 sections, about 555 words (4 min of reading), with 10 flashcards.
In this note
THYROID GLAND
Parts:
Structure:
Capsules of the thyroid gland (2 capsules).
Syntopy :
Innervation.
Histology :
Vasculation :
PARATHYROID GLANDS
Types .
Innervation :
Function :
THYROID GLAND
The largest endocrine gland.
Site : in the lower part of the front of the neck ,and extends to the sides of the neck. (it is in the visceral compartment of the neck). around the trachea. (between C5-T1)
It is H-shaped
Develops from the epithelium of the floor of the mouth.
It is dark brownish in colour.
weight around 18 - 60 g in details.
Parts:
1. Right lobe
2. Left lobe
Extends between oblique line of thyroid cartilage and 4th-5th tracheal ring.
3. Isthmus .connect the two lobes.
Covers 2nd - 4th tracheal ring.
Structure:
Each lobe has:
1. Apex
2. Base
3. 2 borders (anterior and posterior).
4. 3 Surfaces (medial, lateral , and posterolateral)
