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Help with Histology DrPhil 118 Views • 3 years ago

How to approach histology for Human Anatomy students. Using a key will help get you through it! Add some penguin fairy dust will help too!

Please note: I mis-spoke and said "striated" instead of "stratified epithelium" a couple of times... apologies!

There are lots of histology keys out there, but the one I showed in the video is here: http://www.penguinprof.com/upl....oads/8/4/3/1/8431323

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Details:

Tissue in the human body:

Epithelial: Is made of cells arranged in a continuous sheet with one or more layers, has apical & basal surfaces.

A basement membrane is the attachment between the basal surface of the cell & the underlying connective tissue.

Two types of epithelial tissues: (1) Covering & lining epithelia and (2) Glandular Epithelium.

The number of cell layers & the shape of the cells in the top layer can classify epithelium.

Simple Epithelium - one cell layer
Stratified epithelium - two or more cell layers
Pseudostratified Columnar Epithelium - When cells of an epithelial tissue are all anchored to the basement Membrane but not all cells reach the apical surface.
Glandular Epithelium -- (1) Endocrine: Release hormones directly into the blood stream and (2) Exocrine - Secrete into ducts.

Connective: contains many different cell types including: fibroblasts, macrophages, mast cells, and adipocytes. Connective Tissue Matrix is made of two materials: ground substance - proteins and polysaccharides, fiber -- reticular, collagen and elastic.

Classification of Connective Tissue:
Loose Connective - fibers & many cell types in gelatinous matrix, found in skin, & surrounding blood vessels, nerves, and organs.
Dense Connective - Bundles of parallel collagen fibers& fibroblasts, found in tendons& ligaments.
Cartilage - Cartilage is made of collagen & elastin fibers embedded in a matrix glycoprotein & cells called chondrocytes, which was found in small spaces.
Cartilage has three subtypes:
Hyaline cartilage -- Weakest, most abundant type, Found at end of long bones, & structures like the ear and nose,
Elastic cartilage- maintains shape, branching elastic fibers distinguish it from hyaline and
Fibrous Cartilage - Strongest type, has dense collagen & little matrix, found in pelvis, skull & vertebral discs.

Muscle: is divided into 3 categories, skeletal, cardiac and smooth.
Skeletal Muscle -- voluntary, striated, striations perpendicular to the muscle fibers and it is mainly found attached to bones.
Cardiac Muscle -- involuntary, striated, branched and has intercalated discs
Smooth Muscle -- involuntary, nonstriated, spindle shaped and is found in blood vessels & the GI tract.

Nervous: Consists of only two cell types in the central nervous system (CNS) & peripheral nervous system (PNS):
Neurons - Cells that convert stimuli into electrical impulses to the brain, and Neuroglia -- supportive cells.
Neurons -- are made up of cell body, axon and dendrites. There are 3 types of neurons:
Motor Neuron -- carry impulses from CNS to muscles and glands,
Interneuron - interpret input from sensory neurons and end responses to motor neurons
Sensory Neuron -- receive information from environment and transmit to CNS.
Neuroglia -- is made up of astrocytes, oligodendrocytes, ependymal cells and microglia in the CNS, and schwann cells and satellite cells in the PNS.

Hair Transplant Techniques: Difference between FUE vs FUT Alicia Berger 3,200 Views • 3 years ago

Today, hair transplant physicians are able to make use of different techniques to extract and transplant large numbers of hair follicles (follicular units). There are two primary techniques for hair transplantation currently in use. The FUE (Follicular Unit Extraction) and the FUT (Follicular Unit Transplantation) methods. They differ primarily in the way hair follicles are extracted from the donor area. Follicular Unit Transplantation (FUT) The FUT process involves removing a small strip of tissue from the back of the head, from which the donor hair follicles will be extracted. The hair follicles are harvested from the strip by a skilled clinical team before being individually transplanted to the recipient areas. In most cases, and especially cases of advanced hair loss, FUT is the preferred method because it allows the physician to fully utilize the scalp area to deliver results consistent with patient expectations. FUT typically allows for the greatest number of grafts to be transplanted in a single session. Pain Management Some patients report higher levels of discomfort with FUT procedures compared to FUE due the potential swelling in the area where the strip of tissue was removed, but both methods have a very manageable recovery period and pain medication can be prescribed by your physician if needed. Both techniques of hair transplantation are relatively simple. Hair transplantation procedures are outpatient surgeries with some patients going back to work as soon as the very next day. Scarring The FUT strip extraction method typically results in a very narrow linear scar in the back of the head (typically 1mm in diameter or less in size). Since the scar is very thin, it’s easily concealed by all but the shortest of haircut styles. A short to moderate crop setting on most clippers is sufficient to conceal the scar for the majority of patients, and over time the scar will become less noticeable as it fades. Costs The industry norm for pricing is on a per-graft basis. This allows each individual to pay for only what they need and receive in number of grafts, and not a flat rate that in the end may cost you more. The per-graft cost of a FUT procedure is generally lower than that of a FUE procedure. Lately however, in response to the rising popularity of the FUE technique, many hair transplantation clinics have started lowering the per graft cost on FUE procedures, so that the cost difference between the two types of procedure are not as much as most people think. The costs of medical procedures always vary by patients’ conditions, needs and objectives. For the most accurate assessment of your hair loss and the associated cost of your hair restoration, you will need to speak to a physician. Follicular Unit Extraction (FUE) In an FUE hair transplantation, each follicular unit is individually taken directly from the scalp with no strip of tissue being removed. Hair follicles are removed in a random fashion and the result is less density in the donor area that many say is not even noticeable. This is the main difference between FUE & FUT. Since follicles are removed one at a time, fewer follicles can be harvested during a typical session, making FUE a better option to restore hair in smaller cases (number of grafts) compared to the traditional FUT method. FUE is constantly evolving and what was once utilized for only smaller cases is now being utilized for larger and larger cases. Some people that prefer the FUE method may have the option of splitting their procedure into two days in order to complete their recommended transplantation goals. Pain Management With no stitches required and no linear scar left to heal, FUE procedures do have a faster healing time and less post-procedure discomfort compared to the traditional FUT procedure. Scarring Since FUE procedures involve removing hairs individually from the scalp, there is no linear scar left behind. However, there will be tiny 1mm in diameter or less puncture marks that tend to heal by themselves after scabbing-over in the days following the procedure. These tiny wounds typically heal within three to seven days. Costs Since the physician must remove each hair follicle individually, the time-sensitive nature of an FUE procedure typically makes it more expensive than an FUT procedure. As stated earlier, FUE technology is improving as well as gaining popularity and many hair restoration practices (including Bosley) have started to lower the cost per graft price for FUE procedures. Nowadays, the cost difference between a FUE and a FUT procedures is less disparate.

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