Answered: Name the bones of the upper limb, and…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Related questions

Question

Name the bones of the upper limb, and identify their prominent
markings.

Expert Solution

Step 1

There are three parts to the upper limb. The arm, which is situated between the shoulder and elbow joints, the forearm, which is situated between the elbow and wrist joints, and the hand, which is situated distal to the wrist joints, make up this group. Each upper limb contains 30 bones.

Step 2

Humerus: The humerus is the single bone that makes up the upper arm. The head of the humerus is located at its proximal end. This is the broad, flat, circular area on the medial side.
Ulna: The ulna is the forearm's medial joint. It extends parallel to the radius, which is the forearm's longitudinal bone. C-shaped trochlear notch, the proximal end of the ulna suggests a crescent wrench with its broad. As part of the elbow joint, this area articulates with the trochlea of the humerus.
Radius: The shorter of the two long bones of the forearm, extending from the elbow to the wrist. It is the bone on the thumb side of the arm. The radius rotates around the ulna, permitting the hand to rotate and be flexible.
Carpal bone: A sequence of eight small carpal bones make up the wrist and base of the hand. Eight carpal bones make up the foundation of the palm. Two rows of carpal bones are joined together. The scaphoid, lunate, triquetrum, and pisiform bones are found in the proximal row (from lateral to medial). The radiocarpal joint is made up of three bones: the scaphoid, lunate, and triquetrum.
Metacarpal bone: At the bottom of the fingers, the distal end also shapes the knuckles of the hand. Beginning with the thumb, the metacarpal bones are numbered 1–5. The first metacarpal bone is isolated from the other metacarpal bones at the base of the thumb. This gives it an independent range of motion from the other metacarpal bones, which is crucial for thumb mobility.