THYROID GLAND

Thyroid gland
- Synonyms
  - Shield gland , neck gland ,
- Situation
  - C5-C7 and T1
  - embracing upper part of trachea
  - From
    - Middle of thyroid cartilage
  - To
    - Fourth tracheal ring
- Dimensions
  - 5×2.5×2.5 cm
  - 25 grams
  - Larger in females than in males
  - Increases in size during pregnancy
- Parts
  - Right and left lobes
  - Isthmus
    - Joins two lobes
  - Third Pyramidal lobe
    - Projects upwards from isthmus
  - Fibrous muscular band
    - Levator gladulae thyroidae
      - From body of hyoid bone to isthmus or to pyramidal lobe
- Shape
  - Conical
    - Apex
    - Base
- Surfaces
  - Lateral
  - Medial
  - Posterolateral
- Borders
  - Anterior
  - Posterior
- Capsule
  - True capsule
  - False capsule