Hand (Latin: manus) is a body part used about the human hand, usually as an upper limb component. As an anatomical part of the arm, it can be described as an appendage that consists of an upper and lower extremity connected by tendons, ligaments, or muscles. Its upper extremity generally includes the metacarpals and carpals, whereas its lower extremity includes the digits, palm, and wrist.
The hand is a curved, elongated manual body part to which fingers and thumb are attached, with palm on either side of the four joints called phalanges. The term “hand” generally indicates a movement in this area; for example, it may be used when writing to tell the position of a person’s hand.
A human arm consists of the upper limb and forearm between them; both joined by tendons that attach at various points on the elbow, wrist, or finger joints. “Arm” is reported more commonly in reports and used even less frequently in speech. It may sometimes be omitted entirely since most sounds involve a corresponding action (like when saying ball means to bat), as examples would include arm.
Hand Vs. Arm
The hand refers to a body part used about the human hand, usually an upper limb component. The arm describes the anatomy, which connects both extremities and represents more than these parts. As an anatomical part of the arm, it can be characterized as tendons, ligaments, or muscles.
Its upper extremity generally includes metacarpals and carpals, whereas its lower extremity includes digits, palms, and wrists. Hand refers to a movement in the upper area of the hand that is above 5 joints such as the thumb (which acts like fingers), so-called skeletal muscles under elbow joint( only covered by articular cartilage) are not part of the arm.
The word ‘arm’ comes from the Old English “ehra,” meaning an extension or support, and the phrase is common in ancient Greek, Latin, and many other languages of antiquity. Arm: Bilateral symmetry, commonly used to describe cells in the main body of an organism that contains one kin gene. Though this term is generally only found within biology textbooks, words such as arm and hand have everyday use across human culture.
What is a Hand?
The hand is an anatomically joined structure at the end of each arm. Since it’s on opposite sides, with fingers and palm meeting in a point across the wrist, it’s also referred to as an opposable digit(hand) – this happens when humans start walking. The upper limb system consists of joints between bones (the shoulder) and muscles that move the skeleton from side-to-side called flexors and extensors.
The narrowest area of the hand is called the palm. Most commonly used for “goods and merchandise.” The thumb is the largest and strongest muscle in hand; participants in circus acts try to increase strength by routinely stressing it so that rings can be held on small pieces of wood.
Moreover, the thumb is the most commonly used digit, with a right-handed person using their thumb on average more than any other digit. The thumb’s primary role is to manipulate objects and grasp them. It can be considered an essential tool for survival in many environments. For example, our hands are not designed for climbing trees or moving heavy objects; instead, we use them to help us navigate and manipulate objects within our environment.
What is an Arm?
The shoulder girdle is the part of the body that extends from the neck to between two and four feet in length; it consists of bones, specific ligaments, tendons, and muscles. Generally speaking, this area helps hold up our bodies as we move throughout life experience. Our arms are also described commonly as forelimbs, terminating at elbows which connect each arm to various joints within a skeleton.
There are five fingers on the outermost part of the human hand (thumb, index finger, and four other digits) called phalanges. Beyond our wrists and elbows at each arm, we have what is known as a humerus, with two parts- an upper bullet shape that brings energy to move muscles downward within our arms attached by skin only. This joint moves in one plane, said “at right angles,” then it connects through notches lower down where a bone called the humeral head becomes visible- this is also used to move some mass within our arms.
Next, at each elbow out of sight, we have what is known as bones with muscles that create tendons and ligaments, which attach therefore different objects; here, we do not see any skin or blood vessels. The whole arm hangs like a heavy tool rather than being held in line by muscular action alone.
Difference Between Hand and Arm
- Our arms are bones and muscles; our hands mainly consist of skin.
- Our hands have five digits and fingers, our arms usually have four phalanges.
- Our arms can move with a joint; our hands do not have joints and are more of a unit.
- Our palms are the part of our hands that touches the ground when we sit down or stand up (unless it’s a mistake). Arms do not possess this area because they depend on muscles to balance their mass.
- Our hands are designed to manipulate objects; we use them to manage things like picking fruit or brushing our teeth. While an arm is used for movement through space/manipulation of mass and there is only one joint at the elbow connecting motion in an up-wards-directed plane.
Conclusion
The hands primarily serve to manipulate objects and focus on fine motor skills, while arms are used more for movement through space. The muscles that make up each part must be situated ineffective positions to achieve a good result- with this said, hands can undergo a variety of transformations compared to use at rest or during activity. The main differences between hands and arms are seen in how they function and the number of parts that make up each.