Salivary Glands | Ductal System скачать в хорошем качестве

Salivary Glands | Ductal System

Today we will be covering the Salivary glands in detail. Starting from the anatomy of salivary glands to histology of salivary glands of each type, also detailing the development and structure of 3 types of salivary glands. Stay with us, as we go into the details of each type of salivary gland. ▬ 📌 Types of Glands Glands in the human body are organs that produce and release substances that perform specific functions in your body. Glands are present throughout the body and are divided into three types. 👉 Endocrine glands also known as ductless glands, release products directly into the bloodstream. (They include the thyroid gland, adrenal glands, etc.) 👉 Exocrine glands release products to their target area through ducts. (They include salivary glands, sweat glands, etc.) 👉 Paracrine glands release products into extracellular space influencing the cells within the epithelium. (They include gastroenteropancreatic glands.) ▬ 📌 Function of Saliva Salivary glands are the exocrine gland that secretes a complex fluid called saliva. Saliva has many functions, and they are listed as follows: 🟠 Protection 🟠 Buffering 🟠 Tooth integrity 🟠 Antimicrobial activity 🟠 Tissue repair 🟠 Digestion 🟠 Taste ▬ 📌 Types of Salivary Glands Well, you must be wondering what the 3 types of salivary glands are. However, salivary glands are divided into two main categories: The major salivary gland includes the 3 salivary glands: parotid gland, submandibular gland, and sublingual glands. The minor salivary gland includes numerous glands (mucous gland and von Ebner’s gland) ▬ 📌 Structure of Salivary Glands Salivary glands are made from oral epithelium proliferation that grows into the underlying epithelium. The salivary gland consists of ducts and cells. The salivary ducts are branched and are of three types: 🟢 Intercalated ducts 🟢 Striated ducts 🟢 Excretory ducts The salivary ducts end into secretory end pieces or acini that are made of epithelial secretory cells and they are: 🔵 Serous cells 🔵 Mucous cells There is another type of salivary cell called myoepithelial cell that is associated with acini and intercalated ducts. ▬ 📌 Junctions of Salivary Glands The cells in the salivary glands relate to one another with a variety of intercellular junctions. The intercellular junctions of salivary glands are listed below with gap junctions in between. ⚫️ Zonula occluden ⚫️ Zonula adherens ⚫️ Macula adherens Like any other organ, glands have a nerve supply, blood supply, and lymphatic drainage. ▬ 📌 Blood Supply of Salivary Glands 🟣 Parotid gland - external carotid artery 🟣 Submandibular gland - lingual / facial artery 🟣 Sublingual gland - sublingual and submental arteries ▬ 📌 Nerve Supply of Salivary Glands 👉 Parotid gland The parasympathetic nerve supply is derived mainly from the ninth cranial nerve reaching the gland through the otic ganglion and the auriculotemporal nerve. 👉 Submandibular gland The parasympathetic innervation is derived primarily from the seventh cranial nerve reaching the gland through the lingual nerve after synapsing in the submandibular ganglion. 👉 Sublingual gland The parasympathetic nerve supply is also derived from the seventh cranial nerve. It reaches the gland through the lingual nerve after synapsing in the submandibular ganglion. To make it easy for you, we will discuss the nerve supply, blood supply, and lymphatic drainage according to the 3 types of salivary glands. But let us list them down individually below: ▬ 📌 Lymphatic Drainage of Salivary Glands 👉 Parotid gland The lymphatic drainage is through the paraparotid and intraparotid lymph nodes into the superficial and deep cervical lymph nodes. 👉 Submandibular gland The lymphatic drainage is to the deep cervical and jugular chain of nodes. 👉 Sublingual gland The lymphatic drainage is to the submandibular lymph nodes. Note that the parasympathetic innervation is different for each gland, but the sympathetic innervation of all salivary glands is provided by the postganglionic fibers from the superior cervical ganglion and reaches the individual gland in association with their vascular supply. We have finally reached the end of this topic: Salivary Glands. I hope this was informative for you guys. Until next time, stay happy, stay healthy, and study hard with sqadia.com. ▬ 🎬 5500+ sqadia.com Medical Videos ▬▬▬▬▬▬▬▬▬▬ 👩🏻‍⚕️ Accessible Medical Student Education 24/7/365 💡 Simplifying Medical Learning 💪 Study Hard, Dream Big, Achieve More