Upper Limb Anatomy Overview

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Questions and Answers

What is the total number of bones in the upper limb?

30 bones

32 bones (correct)

28 bones

34 bones

How many major arteries are found in the upper limb?

8 major arteries

2 major arteries

4 major arteries (correct)

6 major arteries

Which component is NOT typically included when describing the upper limb?

Joints

Thigh Muscles (correct)

Arteries

Veins

What is the approximate number of major nerves in the upper limb?

17 major nerves Signup and view all the answers

How many muscles are found in the upper limb?

60 muscles Signup and view all the answers

Which of the following is the correct number of joints in the upper limb, excluding intercarpal joints?

26 joints Signup and view all the answers

What anatomical structure is primarily responsible for communication within the upper limb?

Brachial Plexus Signup and view all the answers

How many major veins are present in the upper limb?

4 major veins Signup and view all the answers

Which movement is NOT associated with the shoulder joint?

Pronation & Supination Signup and view all the answers

What is the primary function of the radioulnar joints?

Pronation & Supination Signup and view all the answers

Which joints allow for adduction and abduction movements in the hand?

Metacarpophalangeal Joints Signup and view all the answers

Which statement about the wrist joint is incorrect?

It is proximal to the hand. Signup and view all the answers

Which joint is primarily responsible for flexion and extension of the fingers?

Interphalangeal Joints Signup and view all the answers

Which tendon is most likely to be involved in shoulder pain during initial abduction of the arm?

Supraspinatus Signup and view all the answers

In cases of shoulder pain that affects arm abduction, which muscle can be implicated apart from the supraspinatus?

Infraspinatus Signup and view all the answers

Which of these tendons primarily supports the supraspinatus tendon in shoulder movement?

Teres minor Signup and view all the answers

Which condition is least likely to cause pain during the initial abduction of the arm?

Medial epicondylitis Signup and view all the answers

What is the most likely mechanism of injury associated with supraspinatus tendon pain?

Repetitive overhead activity Signup and view all the answers

Which nerve supplies the anterior compartment of the arm?

Musculocutaneous Nerve Signup and view all the answers

What is the main action of the posterior compartment in the forearm?

Extension Signup and view all the answers

Which of the following compartments in the hand is responsible for the movement of the little finger?

Hypothenar Compartment Signup and view all the answers

Which of the following nerves supplies the median and ulnar nerves in the forearm?

Median & Ulnar Nerves Signup and view all the answers

What is the primary bone that forms the middle segment of the upper limb?

Humerus Signup and view all the answers

What primary action is associated with the anterior compartment of the arm?

Flexion Signup and view all the answers

Which structures form the pectoral (shoulder) girdle?

Clavicle and Scapula Signup and view all the answers

Which of the following actions is primarily performed by the muscles supplied by the radial nerve?

Extension of the arm Signup and view all the answers

Which bones are included in the composition of the upper limb?

Carpal bones, Metacarpal bones, Phalanges Signup and view all the answers

What is the total number of phalanges present in the upper limb?

14 Signup and view all the answers

How many groups of bones make up the radius area in the upper limb?

3 Signup and view all the answers

Which joint movement is associated with the elevation of the upper limb?

Elevation Signup and view all the answers

Identify the correct structure associated with the term 'cubital fossa' in the upper limb.

The area at the elbow Signup and view all the answers

What is the role of the scapula in the upper limb structure?

Supports the pectoral girdle Signup and view all the answers

Which of the following is true regarding the metacarpal bones?

They connect the wrist to the phalanges Signup and view all the answers

Which region is directly associated with the humerus?

Pectoral region Signup and view all the answers

Study Notes

Upper Limb Overview

The upper limb consists of 32 bones, 26 joints (excluding intercarpal joints), 60 muscles, 17 major nerves, 4 main arteries (excluding branches) and 4 main veins (excluding tributaries)

Regions and Compartments

The upper limb is divided into the arm, forearm, and hand
The arm has anterior (flexor) and posterior (extensor) compartments
- The anterior compartment is responsible for flexion and is supplied by the musculocutaneous nerve
- The posterior compartment is responsible for extension and is supplied by the radial nerve
The forearm also has anterior (flexor) and posterior (extensor) compartments
- The anterior compartment is responsible for flexion and is supplied by the median and ulnar nerves
- The posterior compartment is responsible for extension and is supplied by the deep radial nerve
The hand has thenar, central, and hypothenar compartments
- The thenar compartment is responsible for thumb movement and is supplied by the median nerve
- The central compartment is responsible for finger movement and is supplied by the median and ulnar nerves
- The hypothenar compartment is responsible for little finger movement and is supplied by the ulnar nerve

Upper Limb Bones

The upper limb is divided into four segments:
- Pectoral (Shoulder) Girdle: Consists of the clavicle (anteriorly) and scapula (posteriorly)
- Arm: Contains the humerus
- Forearm: Contains the ulna (medially) and the radius (laterally)
- Hand: Consists of three groups
  - 8 carpal bones
  - 5 metacarpal bones
  - 14 phalanges

Upper Limb Joints

Shoulder (Pectoral) Girdle: allows for elevation and depression of the shoulder region
Shoulder Joint: allows for flexion, extension, adduction, abduction, medial and lateral rotation, and circumduction of the arm
Elbow: allows for flexion and extension of the forearm
Radioulnar Joints: allows for pronation and supination of the forearm
Wrist Joint: allows for flexion, extension, adduction, abduction, and circumduction of the hand
Metacarpophalangeal Joints (MCPJ): allows for flexion, extension, adduction, and abduction of the fingers
Interphalangeal Joints (IPJ): allows for flexion and extension of the phalanges

Key Facts

The Supraspinatus tendon is commonly affected in cases of severe pain during initial abduction of the arm.

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Description

This quiz covers the anatomy of the upper limb, including its bones, joints, muscles, nerves, and blood supply. Explore the divisions and compartments of the arm, forearm, and hand, and their respective functions and innervations. Test your knowledge on the complexities of upper limb anatomy.