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The posterior pituitary consists mainly of neuronal projections (axons) extending from thesupraoptic and paraventricular nuclei of the hypothalamus. These axons release peptide hormones into the capillaries of the hypophyseal circulation. In addition to axons, the posterior pituitaryalso contains pituicytes, specialized glial cells resembling astrocytes.
Classification of the posterior pituitary varies, but most sources include the three regions below:Pars nervosaAlso called the neural lobe or posterior lobe, this region constitutes the majority of the posterior pituitary, and is sometimes (incorrectly) considered synonymous with it. Notable features include Herring bodies and pituicytes.[2]Infundibular stalkAlso known as the infundibulum or pituitary stalk, the infundibular stalk bridges the hypothalamic and hypophyseal systems.Median eminenceThis is only occasionally included as part of the posterior pituitary. Other sources specifically exclude it from the pituitary.[3]
A few sources include the pars intermedia as part of the posterior lobe, but this is a minority view. It is based upon the gross anatomical separation of the posterior and anterior pituitary along the cystic remnants of Rathke's pouch, causing the pars intermedia to remain attached to the neurohypophysis.
What else can I help you with?
Does the posterior pituitary gland synthesize oxytocin?
No, the posterior pituitary gland does not synthesize oxytocin. Instead, it stores and releases oxytocin, which is produced in the hypothalamus and transported to the posterior pituitary gland for storage and eventual release in response to certain stimuli.
What are the two sections of the pituitary?
The pituitary gland is divided into two sections: the anterior pituitary (adenohypophysis) and the posterior pituitary (neurohypophysis). The anterior pituitary produces and releases hormones that regulate various physiological processes, while the posterior pituitary stores and releases hormones produced by the hypothalamus.
Does the pituitary gland have glandular and neural tissue?
Yes, the pituitary gland is composed of both glandular and neural tissue. The anterior pituitary is primarily glandular and produces and releases hormones, while the posterior pituitary is neural tissue that stores and releases hormones produced by the hypothalamus.
Does the posterior pituitary gland respond to the gonadotropin-releasing hormone?
No, the posterior pituitary gland does not respond to gonadotropin-releasing hormone (GnRH). The posterior pituitary mainly secretes oxytocin and vasopressin, which are produced in the hypothalamus and stored in the posterior pituitary before being released into the bloodstream. GnRH primarily acts on the anterior pituitary gland to regulate the release of gonadotropins like luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
What gland contains the anterior pituitary?
The anterior pituitary is controlled by the hypothalamus, which releases hormones that stimulate the anterior pituitary to release its own hormones. The anterior pituitary itself is not contained within a particular gland, but is connected to the hypothalamus via the pituitary stalk.
What hormones are synthesized by the posterior pituitary gland?
The posterior pituitary gland stores and releases two hormones synthesized by the hypothalamus: oxytocin and vasopressin (antidiuretic hormone).
Does the posterior pituitary gland synthesize oxytocin?
No, the posterior pituitary gland does not synthesize oxytocin. Instead, it stores and releases oxytocin, which is produced in the hypothalamus and transported to the posterior pituitary gland for storage and eventual release in response to certain stimuli.
What are the two sections of the pituitary?
The pituitary gland is divided into two sections: the anterior pituitary (adenohypophysis) and the posterior pituitary (neurohypophysis). The anterior pituitary produces and releases hormones that regulate various physiological processes, while the posterior pituitary stores and releases hormones produced by the hypothalamus.
Is the posterior pituitary gland a true endocrine gland?
Yes, the posterior pituitary gland is considered a true endocrine gland because it produces and releases hormones into the bloodstream. It stores and releases hormones such as oxytocin and antidiuretic hormone that are produced by the hypothalamus.
What are the two lobes of the pituitary gland?
The pituitary gland is connected to the hypothalamus by a small stalk. The interaction between the nervous system and endocrine is evident in this hypothalamus-pitutary complex. The pituitary gland produces and stores hormones. The hypothalamus simulate the release of hormones by the pituitary gland by way of nerves.The pituitary gland consist of two lobes. The posterior lobe stores and releases hormones, such as ADH and oxytocin. The anterior lobe of the pituitary gland produces its own hormone. It is richly supplied with nerves from the hypothalamus.
Where is the posterior pituitary gland located?
The posterior pituitary is located in a portion of the sphenoid bone called the sella turcica. It is attached to the anterior pituitary gland by the pars intermedia which is a thin layer of endocrine tissue. The posterior pituitary is actually just an extension of the neural tissue that composes the hypothalamus.
Does the pituitary gland have glandular and neural tissue?
Yes, the pituitary gland is composed of both glandular and neural tissue. The anterior pituitary is primarily glandular and produces and releases hormones, while the posterior pituitary is neural tissue that stores and releases hormones produced by the hypothalamus.
What are the two parts of the pituitary gland?
The parts of the pituitary gland are the adenohypophysis (anterior) gland and the neurohypophysis (posterior)
What are Oxytocin and ADH secreted by?
The posterior lobe of the pituitary gland in the brain.
What kind of tissue is posterior pituitary?
The posterior pituitary gland is composed of nervous tissue. It stores and releases hormones produced by the hypothalamus, such as oxytocin and vasopressin, into the bloodstream.
The posterior pituitary gland is not made of glandular tissue?
Correct, the posterior pituitary gland is mostly composed of nerve tissue, specifically axons and nerve endings. It stores and releases hormones produced by the hypothalamus, but it does not manufacture its own hormones like the anterior pituitary gland does.
Does the posterior pituitary gland respond to the gonadotropin-releasing hormone?
No, the posterior pituitary gland does not respond to gonadotropin-releasing hormone (GnRH). The posterior pituitary mainly secretes oxytocin and vasopressin, which are produced in the hypothalamus and stored in the posterior pituitary before being released into the bloodstream. GnRH primarily acts on the anterior pituitary gland to regulate the release of gonadotropins like luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
