Waldeyer’s ring is a collection of lymphoid tissue or follicles in the upper part of digestive system. This ring is formed by: Superiorly- Pharyngeal tonsils or Adenoids. Inferiorly- Lingual tonsil. Laterally- Palatine tonsils and tubal tonsils. I. Pharyngeal Tonsil: Lie postero superiorly under the mucous membrane of the roof and adjoining posterior wall of nasopharynx. […]
Formation of Waldeyer’s Ring | Lymphoid Tissues | Humans | Biology
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Frontal Bone of Human Skull: Parts and Surfaces | Skeletal System | Biology
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In this article we will discuss about the meaning, parts and surfaces of frontal bone which belongs to human skull. Meaning and Parts of Frontal Bone: This is a membrane bone, forms forehead and lodges frontal air sinus, i.e., pneumatic bone. Parts: Three parts are: 1. Squamous part 2. Orbital plates are on either side […]
Parietal Bones of Human Skull | Skeletal System | Biology
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In this article we will discuss about:- 1. Anatomical Structure and Surfaces of Parietal Bones 2. Angles of the Parietal Bones 3. Parts. Anatomical Structure and Surfaces of Parietal Bones: There are two parietal bones present on the top of skull, develops from membrane. Each bone comes in contact – to all the lobes of […]
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