#Chimpanzee hand xray skin
#Chimpanzee hand xray plus

The thumb (connected to the first metacarpal bone and trapezium) is located on one of the sides, parallel to the arm.

little finger, pinky finger, small finger, baby finger, or 5th digit.

middle finger or long finger or 3rd digit.

index finger, pointer finger, forefinger, or 2nd digit.Each finger, starting with the one closest to the thumb, has a colloquial name to distinguish it from the others: The four fingers can be folded over the palm which allows the grasping of objects. There are five digits attached to the hand, notably with a nail fixed to the end in place of the normal claw. It is the area that sustains most pressure when using the palm of the hand for support, such as in handstand. The heel of the hand is the area anteriorly to the bases of the metacarpal bones, located in the proximal part of the palm.The opisthenar area (dorsal) is the corresponding area on the posterior part of the hand.

#Chimpanzee hand xray skin

The skin in this area contains dermal papillae to increase friction, such as are also present on the fingers and used for fingerprints.

The palm (Volar), which is the central region of the anterior part of the hand, located superficially to the metacarpus.

ДЄn adult human male's hand weighs about a pound. The word 'hand' is sometimes used by evolutionary anatomists to refer to the appendage of digits on the forelimb such as when researching the homology between the three digits of the bird hand and the dinosaur hand. Apes and monkeys are sometimes described as having four hands, because the toes are long and the hallux is opposable and looks more like a thumb, thus enabling the feet to be used as hands. The hand is located at the distal end of each arm. Hands must also have opposable thumbs, as described later in the text. The only true grasping hands appear in the mammalian order of primates. The scientific use of the term hand in this sense to distinguish the terminations of the front paws from the hind ones is an example of anthropomorphism.

Many mammals and other animals have grasping appendages similar in form to a hand such as paws, claws, and talons, but these are not scientifically considered to be grasping hands. Likewise, the ten digits of two hands and the twelve phalanges of four fingers (touchable by the thumb) have given rise to number systems and calculation techniques. Like other paired organs (eyes, feet, legs) each hand is dominantly controlled by the opposing brain hemisphere, so that handedness-the preferred hand choice for single-handed activities such as writing with a pencil, reflects individual brain functioning.ДЄmong humans, the hands play an important function in body language and sign language. They also have the greatest positioning capability of the body thus, the sense of touch is intimately associated with hands. Each human hand has five metacarpals and eight carpal bones.ДЇingers contain some of the densest areas of nerve endings in the body, and are the richest source of tactile feedback. The metacarpal bones connect the fingers and the carpal bones of the wrist. It has 27 bones, not including the sesamoid bone, the number of which varies among people, 14 of which are the phalanges ( proximal, intermediate and distal) of the fingers and thumb.

#Chimpanzee hand xray plus

The human hand usually has five digits: four fingers plus one thumb these are often referred to collectively as five fingers, however, whereby the thumb is included as one of the fingers. Some evolutionary anatomists use the term hand to refer to the appendage of digits on the forelimb more generally-for example, in the context of whether the three digits of the bird hand involved the same homologous loss of two digits as in the dinosaur hand. The raccoon is usually described as having 'hands' though opposable thumbs are lacking. A few other vertebrates such as the koala (which has two opposable thumbs on each 'hand' and fingerprints extremely similar to human fingerprints) are often described as having 'hands' instead of paws on their front limbs. A hand is a prehensile, multi- fingered appendage located at the end of the forearm or forelimb of primates such as humans, chimpanzees, monkeys, and lemurs.