Upper Limb Anatomy and Mobility Quiz

The shoulder-shoulder girdle complex allows for a limited range of motion in the upper limb.

The primary function of the arm is to bring the hand to any point in space.

The articular structures of the shoulder complex are primarily designed for stability.

The shoulder complex has 3 degrees of freedom allowing movements to occur in three planes of space.

Flexion of the shoulder occurs in the coronal plane and is limited to 45 degrees.

Adduction moves a limb away from the body while abduction moves it toward the body.

The shoulder complex plays a significant role in generating movements despite its less stabilising features.

The upper limb's main functions include grabbing, supporting, and reaching for objects.

The shoulder joint has less mobility because its surrounding structures provide significant stabilization.

The vertical axis allows for 140° of horizontal abduction.

The long axis of the humerus permits only lateral rotation.

Circumduction of the arm creates a perfect circular base.

The arm's maximal range of circumduction combines movements about three cardinal axes.

The apex of the conical surface described by the arm is located at the shoulder joint.

The shoulder complex allows for flexion in the sagittal plane at an angle of 90°.

Diagonal push and pull movements are characteristic of work performed by the arm.

The hand can reach all parts of the body without any trunk displacement during circumduction.

The range of medial rotation of the humerus can extend from 70° to 120°.

The shoulder complex primarily operates in a single plane of motion.

The subacromial joint is a synovial joint consisting of distinct articulating surfaces.

The scapulothoracic joint has the characteristics of a classic synovial joint.

The acromioclavicular joint is one of the primary interdependent linkages of the shoulder complex.

The sternoclavicular joint is the main structural junction connecting the upper extremity to the sternum.

The movements of the shoulder girdle primarily originate from the muscles located on the scapula.

The glenohumeral joint is often referred to as the shoulder joint.

The glenohumeral joint comprises both structural and functional components.

Movement within the sternoclavicular joint does not influence the acromioclavicular joint.

The clavicle, scapula, and humerus are three segments of the shoulder complex that interconnect at four joints.

The subacromial space serves as a functional articulation part of the shoulder complex.

The primary upward rotator muscles of the scapula include the lower fibers of the serratus anterior and the upper fibers of the trapezius during the early phase.

The antagonists of the shoulder's flexion action include the biceps brachii and the coracobrachialis.

The primary muscles responsible for shoulder adduction are the latissimus dorsi, teres major, and the inferior head of the pectoralis major.

Isotonic eccentric actions are employed by the muscles during the backward movement from a 180° elevated position.

Five of the seven adductor-extensor muscles connect primarily to the stable scapula.

The posterior deltoid acts as a primary mover in shoulder adduction when the arm is below 90°.

The scapulohumeral rhythm ratio is 3:1 during the first 30° of humerus abduction.

A full arc of 180° of shoulder abduction consists of 60° from the GH joint and 120° from the scapulothoracic joint.

During the setting phase of scapulohumeral rhythm, the humerus undergoes 30° of abduction with minimal scapula movement.

The primary aim of scapulohumeral rhythm is to decrease joint congruency.

In the second phase of scapulohumeral rhythm, the scapula rotates by 40° with significant protraction.

The serratus anterior plays a crucial role in upward rotation of the scapula during the third phase of abduction.

Active insufficiency is prevented by allowing muscles to maintain a poor length-tension relation.

The primary movers during a motion are also known as antagonists.

Clavicle elevation occurs significantly in the third phase of scapulohumeral rhythm at 15°.

Synergist muscles are those that oppose the desired action at a joint.