Podcast
Questions and Answers
What is the primary function of the sternoclavicular joint in relation to the upper extremity?
What is the primary function of the sternoclavicular joint in relation to the upper extremity?
- To increase the range of motion of the shoulder for greater reach (correct)
- To provide a direct connection between the upper extremity and the lumbar spine
- To facilitate the movement of the lower extremity during walking
- To support the weight of the upper body during lifting movements
How many degrees of rotation occur at the sternoclavicular joint during upward and downward movements?
How many degrees of rotation occur at the sternoclavicular joint during upward and downward movements?
- 60 degrees (correct)
- 45 degrees
- 120 degrees
- 90 degrees
Which ligaments are involved in maintaining the stability of the sternoclavicular joint?
Which ligaments are involved in maintaining the stability of the sternoclavicular joint?
- Coracoclavicular ligament and posterior SC ligament
- Acromioclavicular ligament and anterior SC ligament
- Costoclavicular ligament and anterior SC ligament (correct)
- Posterior SC ligament and supraspinatus tendon
What type of joint movement does the sternoclavicular joint NOT facilitate?
What type of joint movement does the sternoclavicular joint NOT facilitate?
In terms of degrees of freedom (DOF), how many degrees of freedom does the sternoclavicular joint have?
In terms of degrees of freedom (DOF), how many degrees of freedom does the sternoclavicular joint have?
Which component of the sternoclavicular joint helps in shock absorption?
Which component of the sternoclavicular joint helps in shock absorption?
What role does the transverse rotation of the scapula at the sternoclavicular joint play?
What role does the transverse rotation of the scapula at the sternoclavicular joint play?
The position of the disk and clavicle at the sternoclavicular joint primarily relates to which movements?
The position of the disk and clavicle at the sternoclavicular joint primarily relates to which movements?
What characteristic shape of the shoulder girdle is described?
What characteristic shape of the shoulder girdle is described?
What is the angular value of shoulder girdle elevation?
What is the angular value of shoulder girdle elevation?
Which ligament connects the glenoid labrum to the humeral neck?
Which ligament connects the glenoid labrum to the humeral neck?
What does protraction of the shoulder girdle involve?
What does protraction of the shoulder girdle involve?
What is the maximum range of motion for upward rotation of the shoulder girdle?
What is the maximum range of motion for upward rotation of the shoulder girdle?
How far can the scapula retract in degrees?
How far can the scapula retract in degrees?
What is Sprenger's deformity characterized by?
What is Sprenger's deformity characterized by?
What is the function of the transverse humeral ligament?
What is the function of the transverse humeral ligament?
What is the angular value of shoulder girdle depression?
What is the angular value of shoulder girdle depression?
What is the distance associated with Sprenger's deformity in terms of scapula position?
What is the distance associated with Sprenger's deformity in terms of scapula position?
What is the primary function of the bicipital groove?
What is the primary function of the bicipital groove?
Which structure connects the right and left clavicle?
Which structure connects the right and left clavicle?
What type of joint is the scapulothoracic joint classified as?
What type of joint is the scapulothoracic joint classified as?
Which of the following movements does the scapulothoracic joint NOT permit?
Which of the following movements does the scapulothoracic joint NOT permit?
The suprahumeral joint is also known as what?
The suprahumeral joint is also known as what?
What is the main action of the trapezius muscle?
What is the main action of the trapezius muscle?
Which nerve innervates the trapezius muscle?
Which nerve innervates the trapezius muscle?
Where is the muscle origin for the upper fibers of the trapezius located?
Where is the muscle origin for the upper fibers of the trapezius located?
Which muscle is typically involved in palpation techniques during shoulder examinations?
Which muscle is typically involved in palpation techniques during shoulder examinations?
What degree of elevation does the scapulothoracic joint permit?
What degree of elevation does the scapulothoracic joint permit?
Study Notes
Bicipital Groove
- Prevents superior motion/elevation of the humerus.
- Located between the lesser and greater tubercle of the humerus.
- Allows for inferior motions/depression, accommodating the tendon of the long head of the biceps.
Interclavicular Ligament
- Connects the right and left clavicle, contributing to shoulder stability.
False Joints
- Defined as pseudo or functional joints; lack direct bone-to-bone articulation.
Scapulothoracic Joint
- Articulates between the thoracic fascia and the fascia of the serratus anterior.
- Allows for 3 degrees of freedom (DOF):
- Elevation (up to 10 cm)
- Depression (up to 2 cm)
Suprahumeral Joint
- Also known as the supraspinatus outlet; facilitates movement between the humeral neck and coracoacromial arch.
- Named musculus cucularis, commonly referred to as the shawl muscle.
- Palpation performed in an inclined forward or prone position, assisting with shoulder abduction and scapular retraction.
Trapezius Muscle
- Divided into three parts:
- Upper: arises from occipital bone
- Middle: originates from ligamentum nuchae
- Lower: attaches to spinous processes of C7-T12
- Insertions:
- Upper: acromial end of clavicle
- Middle: spine of scapula
- Lower: acromion process
- Innervated by the spinal accessory nerve (C3-C4, CN XI).
- Actions include elevation and upward rotation of the shoulder.
True Joints
- Characterized by the meeting of two or more bones to allow movement.
- Synovial joints provide flexibility and range of motion.
Shoulder Girdle
- Comprises scapula, clavicle, and manubrium with an anterior, lateral, and superior orientation.
- Angular value of elevation is approximately 60 degrees.
- Features a pear shape, characterized by a wide inferior and narrow superior structure (WINS).
- Sprenger’s deformity refers to a congenital high scapula condition, measuring 5-6 inches (13-15 cm) in vertical positioning.
Glenohumeral Ligament
- Known as the Z ligament; connects the glenoid labrum to the humeral neck and lesser tubercle.
- The weakest shoulder ligament with superior, middle, and inferior parts.
Transverse Humeral Ligament
- Connects the lesser and greater tubercle of the humerus, providing additional stability.
Sternoclavicular Joint
- Articulation between the sternum and sternal end of the clavicle.
- The only joint directly connecting the upper extremity to the axial skeleton.
- Provides 3 degrees of freedom:
- Protraction and retraction
- Elevation and depression
- Transverse rotation of the scapula
- Features fibrocartilage/meniscus in its capsule for stability and shock absorption.
Ligaments of the Sternoclavicular Joint
- Anterior SC ligament resists anterior motions.
- Posterior SC ligament resists posterior motions.
- Costoclavicular ligament connects the clavicle to the first rib, enhancing joint stability and function.
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Description
Test your knowledge on the bicipital groove and its components in human anatomy. This quiz covers the functions and anatomy related to the bicipital groove, including its role in motion and the interclavicular ligament. Perfect for students studying anatomy or related fields!
