NURSING 2LA2 Lecture Notes - Lecture 6: Somatostatin, Sphenoidal Sinus, Melanocyte-Stimulating Hormone
Document Summary
2 areas- posterior and anterior and the infundibulum. Anterior creates hormones and releases them, it is a gland. Posterior, starts from the bottom, neurohypophysis because it arises from neurological tissue ( neurons in the hypothalamus) Ectoderm thickens at neurohypophyseal bud ----->posterior hypophyseal pouch ----->anterior. No relationship between the anterior and posterior pituitary. Hypophyseal fossa in skull there"s a dip and 2 walls come up on the side. Walls are tuberculum sellae (anterior), and dorsal sellae (posterior) Pituitary is in the hypophyseal fossa (very thin bone) Hypophyseal fossa is above the sphenoid sinus (air) Pituitary grows tumors commonly and since there"s no space to go down, it takes up space upwards (pushes up) Can access pituitary through nose (through sphenoid bone, sinus, and the sella turcika to get to pit) Tumors are not functional most of the time. Superior hypophyseal artery is main blood supply sends off capilary bed then becoming the hypophyseal portal complex then another capillary bed.
