View source for Lobes of thyroid gland

{{Infobox Anatomy |
  Name         = {{PAGENAME}} |
  Latin        = lobuli glandulae thyroideae |
  GraySubject  = 272 |
  GrayPage     = 1269 |
  Image        = Gray1174.png |
  Caption      = The thyroid gland and its relations. (Lateral lobe labeled at center left.)  |
  Image2       = |
  Caption2     = |
  System       = |
  Precursor    = |
  MeshName     = |
  MeshNumber   = |
  DorlandsPre  = l_13 |
  DorlandsSuf  = 12501100 |
}}
{{SI}}

The '''lobes of the [[thyroid gland]]''' are conical in shape, the apex of each being directed upward and lateralward as far as the junction of the middle with the lower third of the [[thyroid cartilage]]; the base looks downward, and is on a level with the fifth or sixth [[tracheal ring]]. 

Each lobe is about 5 cm. long; its greatest width is about 3 cm., and its thickness about 2 cm. 

The lateral or superficial surface is convex, and covered by the skin, the superficial and deep fasciæ, the [[Sternocleidomastoideus]], the superior belly of the [[Omohyoideus]], the [[Sternohyoideus]] and [[Sternothyreoideus]], and beneath the last muscle by the pretracheal layer of the [[deep fascia]], which forms a capsule for the gland. 

The deep or medial surface is moulded over the underlying structures, viz., the [[thyroid]] and [[cricoid cartilage]]s, the [[Vertebrate trachea|trachea]], the [[Constrictor pharyngis inferior]] and posterior part of the [[Cricothyreoideus]], the [[esophagus]] (particularly on the left side of the [[neck]]), the superior and [[inferior thyroid arteries]], and the [[recurrent nerves]]. 

The anterior border is thin, and inclines obliquely from above downward toward the middle line of the neck, while the posterior border is thick and overlaps the [[common carotid artery]], and, as a rule, the [[parathyroids]].

==External links==
* {{SUNYAnatomyFigs|26|01|06}}

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