A Wisdom Archive on wrist

The carpal tunnel is a fibro-osseous tunnel on the palmar surface of the carpal bones which transmits a number of tendons and the median nerve from the forearm into the hand. Surface markings are, proximally, the distal wrist crease; distally, the hook of the hamate bone. The recurrent thenar branch of the median nerve, the motor branch to the thenar eminence, leaves the median nerve in or beyond the carpal tunnel, then curves back over the flexor retinaculum to reach the thenar eminence. It is endangered in carpal tunnel surgery if the incision ...

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Watch - Pocket clock. The earliest need for portability in time keeping was navigation and mapping in the 15th century. The latitude could be measured by looking at the stars, but the only way a ship could measure its longitude was by comparing timezones; by comparing the midday time of the local longitude to a European meridian (usually Paris or Greenwich), a sailor could know how far he was from home. However, the process was notoriously unreliable until the introduction of John Harrison's chronometer. For that reason, most maps from the 15th century to c.1800 have pre ...

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Metal pans filled with charcoal were used for smoothing fabrics in China in the 1st century BC. From the 17th century, sadirons or sad irons (from an old word meaning solid) began to be used. They were thick slabs of cast iron, delta-shaped and with a handle, heated in a fire. A later design consisted of an iron box which could be filled with hot coals, which had to be periodically aerated by attaching a bellows. This type was on s ...

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Structures near the midline are called medial and those near the sides of animals are called lateral. Therefore, medial structures are closer to the midsagittal plane, lateral structures are further from the midsagittal plane. Structures in the midline of the body are median. For example, your cheeks are lateral to your nose and the tip of the nose is in the median line. Ipsilateral means on the same side, contralateral

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Anatomical terms of location - General usage. Three basic reference planes are used in zoological anatomy. The sagittal plane divides the body into left and right portions. A coronal plane divides the body into dorsal and ventral portions. A transverse plane divides the body into cranial and caudal portions. Anatomical terms of location - Usage in human anatomy. Sometimes the orientation of certain planes need to be distinguished, for instance in medical im ...

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Flexion means approximating adjacent parts of the body (usually at a joint) and extension means separating them. For example, the legs are flexed at the knee joints when sitting down, and extended when standing up. Generally, flexion produces an acute angle between adjacent parts, with its vertex at the joint, and extension produces an obtuse angle. One exception to this rule is in the ankle joint where moving the foot such that the toes move upwards is dorsiflexion and moving the ...

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Ironing - Manual. Modern irons available for sale to consumers have some or all of the following features (more expensive models have more features, as one would expect): Ejection of steam through the clothing during the ironing process; A water reservoir inside the iron (used for the steam generation); An indicator showing the amount of water left in the reservoir; A thermostat ensuring maintenance of a constant temperature; Convenient method for setting the iron ...

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Some cases of carpal tunnel syndrome are due to work-related cumulative trauma of the wrist. It is commonly caused by strain placed on the hand, for instance gripping and typing, which are usually performed repetitively in a person's occupation. The condition was first diagnosed in Australia in the 1980s when musicians started to use synthesizers heavily and people using these instruments started to get hand and wrist pain. The condition went mostly undiagnosed in the US until the mid 1990s when computers became more popular in the workplace. There are a number of causes of carpal tunnel syndrome ...

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Anatomical terms of location - General usage. Animals typically have one end with a head and mouth, with the opposite end often having the anus and tail. The head end is the cranial end; the tail end is the caudal end. Within the head itself, rostral refers to the direction toward the end of the nose, and caudal is still used to refer to the tail direction. The surface or side of the body normally oriented upwards, away from the pull of gravity, is the dorsal side; the opposite ...

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