Ch. 7 The Skeletal System

Amerman - Human Anatomy & Physiology 2nd Edition

Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook

Amerman 2nd Edition

Ch. 7 The Skeletal System

Problem 13

Chapter 7, Problem 13

The only bone of the arm is the _. The forearm consists of the medial and the lateral_.

Verified step by step guidance

Step 1: Understand the anatomy of the arm and forearm. The arm refers to the region between the shoulder and the elbow, while the forearm is the region between the elbow and the wrist.

Step 2: Recall that the arm contains only one bone, which is the largest and strongest bone in this region. This bone connects the shoulder to the elbow.

Step 3: For the forearm, identify the two bones present. One is located medially (closer to the body's midline), and the other is located laterally (farther from the body's midline).

Step 4: The medial bone of the forearm is longer and forms the primary articulation with the humerus at the elbow joint. The lateral bone is shorter and plays a key role in wrist movement.

Step 5: Fill in the blanks with the correct anatomical terms: the bone of the arm is the 'humerus,' the medial bone of the forearm is the 'ulna,' and the lateral bone of the forearm is the 'radius.'

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Humerus

The humerus is the long bone of the upper arm, extending from the shoulder to the elbow. It plays a crucial role in the arm's structure and function, serving as the attachment point for muscles that facilitate movement. Understanding the humerus is essential for comprehending the anatomy of the arm.

Ulna

The ulna is one of the two bones in the forearm, located on the medial side (the side closest to the body). It is longer than the radius and forms the elbow joint with the humerus. The ulna is important for the stability and movement of the forearm and wrist.

Radius

The radius is the other bone in the forearm, situated laterally (on the side away from the body) relative to the ulna. It is shorter than the ulna and plays a key role in the rotation of the forearm, allowing for movements such as pronation and supination. Understanding the radius is vital for grasping the functional anatomy of the forearm.

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Overview of the Arm and Forearm

Related Practice

Textbook Question

Which of the following is not a proximal carpal bone?

a. Hamate

b. Pisiform

c. Scaphoid

d. Lunate

The inferior portion of the sternum is the_____ . The superior portion of the sternum is the_____, and it articulates with the______ and the first rib.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. The obturator foramen articulates with the head of the femur at the hip joint.

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Textbook Question

Which of the following portions of the scapula articulates with the clavicle?

a. Coracoid process

b. Acromion

c. Spine