Hand Function: Difference between revisions
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== Introduction == | == Introduction == | ||
The major function of human hand is to manipulate objects to accomplish a goal. | |||
== | The ability of a human hand to assure a myriad of position and to apply only the precise amount of pressure necessary to hold an object is due to: the mobility and stability supplied by the skeleton: the power of the muscle; the remarkable degree of sensory feedback from the nerves. | ||
The sensory feedback is used to asses the shape ,size, texture and weight of the object .The feedback used in both grasping and lifting of an object is dependent on the brain interpreting correctly, what is seen on the hand responding appropriately.<ref>UK Essays [https://www.ukessays.com/essays/psychology/the-major-function-of-human-hand-psychology-essay.php The Major Function Of Human Hand] Psychology Essay Available from:https://www.ukessays.com/essays/psychology/the-major-function-of-human-hand-psychology-essay.php (last accessed 27.3.2020)</ref> | |||
== Relevant Anatomy == | |||
The features of human hands are easily distinguishable from those of the great apes, and they underpin the refined function and manipulatory abilities of our hands. | |||
* The most complex adaptations of the human hand involve the thumb, wherein a unique, fully independent muscle (the flexor pollicis longus) gives this digit remarkable strength in pinch and power grips. | |||
* The fingertips are broad and equipped with highly sensitive pads of skin. | |||
* The proportional lengths of the thumb and other fingers give us an opposable thumb with precise, firm contact between its tip and the ends of each of the other fingers. | |||
* A special saddle joint and associated ligaments at the base of the thumb facilitate refined rotation. | |||
* Special configurations of joints at the bases of the fifth, fourth, and second fingers facilitate tip-to-tip precision grips with the thumb. | |||
* Asymmetry of the heads of the second and fifth palm bones allows rotation of the articulated fingers during opposition with the thumb. | |||
* The small muscles in the hand allow fine control of the thumb and fingers.<ref>ENCYCLOPÆDIA BRITANNICA [https://www.britannica.com/science/human-evolution/The-fossil-evidence Human Evolution] Available from:https://www.britannica.com/science/human-evolution/The-fossil-evidence (last accessed 27.3.2020)</ref> | |||
== Sub Heading 3 == | == Sub Heading 3 == | ||
Revision as of 07:17, 27 March 2020
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Top Contributors - Lucinda hampton, Kim Jackson, Chrysolite Jyothi Kommu and Shaimaa Eldib
Introduction[edit | edit source]
The major function of human hand is to manipulate objects to accomplish a goal.
The ability of a human hand to assure a myriad of position and to apply only the precise amount of pressure necessary to hold an object is due to: the mobility and stability supplied by the skeleton: the power of the muscle; the remarkable degree of sensory feedback from the nerves.
The sensory feedback is used to asses the shape ,size, texture and weight of the object .The feedback used in both grasping and lifting of an object is dependent on the brain interpreting correctly, what is seen on the hand responding appropriately.[1]
Relevant Anatomy[edit | edit source]
The features of human hands are easily distinguishable from those of the great apes, and they underpin the refined function and manipulatory abilities of our hands.
- The most complex adaptations of the human hand involve the thumb, wherein a unique, fully independent muscle (the flexor pollicis longus) gives this digit remarkable strength in pinch and power grips.
- The fingertips are broad and equipped with highly sensitive pads of skin.
- The proportional lengths of the thumb and other fingers give us an opposable thumb with precise, firm contact between its tip and the ends of each of the other fingers.
- A special saddle joint and associated ligaments at the base of the thumb facilitate refined rotation.
- Special configurations of joints at the bases of the fifth, fourth, and second fingers facilitate tip-to-tip precision grips with the thumb.
- Asymmetry of the heads of the second and fifth palm bones allows rotation of the articulated fingers during opposition with the thumb.
- The small muscles in the hand allow fine control of the thumb and fingers.[2]
Sub Heading 3[edit | edit source]
Resources[edit | edit source]
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References[edit | edit source]
- ↑ UK Essays The Major Function Of Human Hand Psychology Essay Available from:https://www.ukessays.com/essays/psychology/the-major-function-of-human-hand-psychology-essay.php (last accessed 27.3.2020)
- ↑ ENCYCLOPÆDIA BRITANNICA Human Evolution Available from:https://www.britannica.com/science/human-evolution/The-fossil-evidence (last accessed 27.3.2020)
