cephalic phase

頭相

WordNet

1. arrange in phases or stages; "phase a withdrawal"
2. (physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary; "the reaction occurs in the liquid phase of the system" (同)form
3. a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle (同)phase_angle
4. any distinct time period in a sequence of events; "we are in a transitional stage in which many former ideas must be revised or rejected" (同)stage
5. adjust so as to be in a synchronized condition; "he phased the intake with the output of the machine"
6. (astronomy) the particular appearance of a bodys state of illumination (especially one of the recurring shapes of the part of Earths moon that is illuminated by the sun); "the full phase of the moon"
7. of or relating to the head

PrepTutorEJDIC

1. (変化・発達の)『段階』,『局面』 / (物事の)『面』,様相《+『of』+『名』》 / (月・惑星などの)相 / …‘を'段階的に調整(整理)する
2. 頭蓋(ずがい)の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/30 16:00:39」(JST)

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The cephalic phase of gastric secretion occurs even before food enters the stomach, especially while it is being eaten. It results from the sight, smell, thought, or taste of food, and the greater the appetite, the more intense is the stimulation. Neurogenic signals that cause the cephalic phase of gastric secretion originate from the cerebral cortex and in the appetite centers of the amygdala and hypothalamus.They are transmitted through the dorsal motor nuclei of the vagi and then through the vagus nerve to the stomach. This phase of secretion normally accounts for about 20 percent of the gastric secretion associated with eating a meal.

This enhanced secretory activity brought on by the thought or sight of food is a conditioned reflex. It only occurs when we like or want food. When appetite is depressed this part of the cephalic reflex is inhibited.

Effects on gastric secretion

Cephalic phase cause ECL cells to secrete histamine and increase HCl acid in the stomach. There will also be an influence on G cells to increase gastrin circulation. It will also stimulate Chief cells to release Pepsinogen.

Chain of Events (Nervous System)

Thinking of food (i.e. smell, sight) – Stimulates cerebral cortex – Sends messages to hypothalamus – to the medulla oblongata – to parasympathetic nervous system by the vagus nerve – to stomach (Gastric Glands in walls of fundus and body of stomach) – to secrete gastric juice. (nervous system and hormone system)

a. Food enters stomach – stomach stretches and activates stretch Receptors – sends message to the medulla oblongata (vagus nerve) and then back – to stomach by the vagus nerve — Result: parietal cell secrete gastric juice.

b. Chemical Stimuli (i.e. partially digested proteins, caffeine) – directly activates – G cells (Enteroendocrine Cells) located in the pyloric region of the stomach – to secrete gastrin – Gastrin stimulates – Gastric Glands to secrete gastric Juice.

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Related Links

• What Is the Cephalic Phase? (with picture)

The cephalic phase is a part of digestion in which the brain sends a signal to the stomach to start producing gastric juices. This... ... Without the cephalic stage, the stomach would be unable to produce the necessary digestive ...

• Animation: Three Phases of Gastric Secretion

Seeley's Anatomy and Physiology 7e website for a two-semester course. ... 2 Which of the following does not occur during the gastric phase of gastric secretion? A) Gastrin begins to be secreted by the lower part of the stomach.

Related Pictures

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★リンクテーブル★

リンク元	「脳相」「頭相」
関連記事	「phase」「cephalic」「phased」「cephal」

「脳相」

　　[★]

英

cephalic phase

関

頭相、胃液分泌

「頭相」

　　[★]

英

cephalic phase

関

胃液分泌

「phase」

　　[★]

• n.

• 相、段階、時期、局面、位相、フェーズ

• v.

• 段階的に実行する

関

aspect、grade、period、phased、phasic、situation、stage、step、time

　 　 　 　 　 　 　

「cephalic」

　　[★]

• adj.

• 頭の、頭部の

関

capitis、caput、cephalon、head、headgroup

　 　

「phased」

　　[★]

• adj.

• 位相の

関

phase、phasic

「cephal」

　　[★]

• comb form

• 頭

ex.

• cephalus