Podcast
Questions and Answers
All fibers of the pectoralis major muscle converge on the lateral edge of the _______________.
All fibers of the pectoralis major muscle converge on the lateral edge of the _______________.
interubercular sulcus
The anterior axial muscle that crosses the glenohumeral joints is the pectoralis major muscle.
The anterior axial muscle that crosses the glenohumeral joints is the pectoralis major muscle.
True
The posterior axial muscle that crosses the glenohumeral joint is the ___________________________.
The posterior axial muscle that crosses the glenohumeral joint is the ___________________________.
latissimus dorsi
The deltoid muscle fibers are separated into __________________.
The deltoid muscle fibers are separated into __________________.
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The middle fibers of the deltoid muscle __________________.
The middle fibers of the deltoid muscle __________________.
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The external intercostals elevate the rib cage during ____________.
The external intercostals elevate the rib cage during ____________.
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The origin of the external obliques includes ribs ________________.
The origin of the external obliques includes ribs ________________.
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The infraspinatus inserts on the ____________ of the humerus.
The infraspinatus inserts on the ____________ of the humerus.
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The infraspinatus muscle is included in the __________ muscles.
The infraspinatus muscle is included in the __________ muscles.
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The actions of the internal intercostals are most important during __________.
The actions of the internal intercostals are most important during __________.
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The actions of the internal obliques include ____________________.
The actions of the internal obliques include ____________________.
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The latissimus dorsi inserts _____________________.
The latissimus dorsi inserts _____________________.
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One of the actions of the latissimus dorsi muscle is to _____________________.
One of the actions of the latissimus dorsi muscle is to _____________________.
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Which joint is considered the most flexible joint in the body?
Which joint is considered the most flexible joint in the body?
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Muscles of the shoulder can be divided into groups based on __________.
Muscles of the shoulder can be divided into groups based on __________.
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Which of the following groups of muscles are not muscles of the shoulder?
Which of the following groups of muscles are not muscles of the shoulder?
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Of the nine muscles that cross the shoulder joint and insert on the humerus, which muscle is considered to be a prime mover?
Of the nine muscles that cross the shoulder joint and insert on the humerus, which muscle is considered to be a prime mover?
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Which of the following muscles is not part of the shoulder?
Which of the following muscles is not part of the shoulder?
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The pectoralis muscle can be divided into groups of fibers superior, or __________, and inferior, or __________.
The pectoralis muscle can be divided into groups of fibers superior, or __________, and inferior, or __________.
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The key actions of the pectoralis major muscles are __________.
The key actions of the pectoralis major muscles are __________.
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The pectoralis minor muscle is innervated by the __________.
The pectoralis minor muscle is innervated by the __________.
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Which muscle is not part of the rotator cuff?
Which muscle is not part of the rotator cuff?
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The angle of which muscle prevents the humeral head from sliding upward out of the joint as the arm is raised?
The angle of which muscle prevents the humeral head from sliding upward out of the joint as the arm is raised?
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Downward dislocation of the humerus from the glenohumeral joint when carrying weight is prevented by the __________.
Downward dislocation of the humerus from the glenohumeral joint when carrying weight is prevented by the __________.
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The rotator cuff is a term used to describe the group of muscles and tendons that stabilize and reinforce the __________.
The rotator cuff is a term used to describe the group of muscles and tendons that stabilize and reinforce the __________.
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All the tendons of the rotator cuff muscles combine at which location?
All the tendons of the rotator cuff muscles combine at which location?
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The origin of the serratus anterior includes __________ ribs.
The origin of the serratus anterior includes __________ ribs.
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The subscapularis muscle inserts on the __________.
The subscapularis muscle inserts on the __________.
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The insertion of the supraspinatus muscle is on the __________.
The insertion of the supraspinatus muscle is on the __________.
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The teres major adducts the arm but does not _______________ the arm.
The teres major adducts the arm but does not _______________ the arm.
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The insertion of the teres minor is on the __________.
The insertion of the teres minor is on the __________.
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The trapezius muscle may be separated into all of the following groups, except __________.
The trapezius muscle may be separated into all of the following groups, except __________.
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All fibers of the trapezius muscle are innervated by the _____________.
All fibers of the trapezius muscle are innervated by the _____________.
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Identify the levator ani muscle.
Identify the levator ani muscle.
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What is the name and origin of the muscle at A?
What is the name and origin of the muscle at A?
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Which muscle is innervated by the S3 nerve, S4 nerve, and the inferior rectal nerve (a branch of the pudendal nerve)?
Which muscle is innervated by the S3 nerve, S4 nerve, and the inferior rectal nerve (a branch of the pudendal nerve)?
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Which muscle inserts on the greater tubercle of the humerus?
Which muscle inserts on the greater tubercle of the humerus?
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Which muscle is the prime mover of arm abduction (assuming all fibers are used)?
Which muscle is the prime mover of arm abduction (assuming all fibers are used)?
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Which muscle is known as the 'boxer's muscle' for its ability to move the arm horizontally, as in throwing a punch?
Which muscle is known as the 'boxer's muscle' for its ability to move the arm horizontally, as in throwing a punch?
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Which of the following muscles is known in this image but is NOT indicated with a letter?
Which of the following muscles is known in this image but is NOT indicated with a letter?
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Which muscle is a prime mover of arm abduction?
Which muscle is a prime mover of arm abduction?
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Which of the following is not a muscle primarily involved in the breathing process?
Which of the following is not a muscle primarily involved in the breathing process?
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The supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?
The supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?
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The abnormal protrusion of the small intestine through a weak point in the muscle of the abdominal wall is called a ____________.
The abnormal protrusion of the small intestine through a weak point in the muscle of the abdominal wall is called a ____________.
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The ________ is a synergist of the latissimus dorsi; it extends, medially rotates, and adducts the humerus.
The ________ is a synergist of the latissimus dorsi; it extends, medially rotates, and adducts the humerus.
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Which of the following is INCORRECTLY paired?
Which of the following is INCORRECTLY paired?
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Which of the following is NOT a rotator cuff muscle?
Which of the following is NOT a rotator cuff muscle?
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Study Notes
Muscles of the Shoulder and Arm
- The intertubercular sulcus is the convergence point for all fibers of the pectoralis major muscle.
- The pectoralis major is the anterior axial muscle crossing the glenohumeral joint.
- The latissimus dorsi is the posterior axial muscle that crosses the glenohumeral joint.
- Deltoid muscle fibers are divided into anterior, middle, and posterior groups.
- The middle fibers of the deltoid muscle are responsible for arm abduction.
- External intercostals elevate the rib cage during inspiration.
- The external obliques originate from ribs five through twelve.
- The infraspinatus muscle inserts on the greater tubercle of the humerus, contributing to shoulder stability.
- The infraspinatus is included among the rotator cuff muscles.
- Internal intercostals are most crucial during forced expiration.
- Functions of internal obliques include compression of the abdomen to assist in forced expiration.
- The latissimus dorsi inserts on the intertubercular groove of the humerus.
- One of the primary actions of the latissimus dorsi is to adduct the arm.
- The shoulder joint is recognized as the most flexible joint in the body.
- Muscles of the shoulder can be categorized based on their distribution and functional relationship.
- Anterior flexor muscles are not categorized as shoulder muscles.
- Deltoid is the prime mover among the nine muscles that cross the shoulder joint and insert on the humerus.
- Brachialis is not included in the shoulder muscle group.
- The pectoralis major can be divided into clavicular (superior) and sternocostal (inferior) portions.
- Key actions of pectoralis major include medial rotation and adduction of the arm.
- The pectoral nervous innervates the pectoralis minor muscle.
- The teres major muscle is not part of the rotator cuff.
- The subscapularis prevents the humeral head from sliding upward out of the joint during arm elevation.
- The supraspinatus muscle prevents downward dislocation of the humerus when carrying weight.
- The rotator cuff stabilizes the glenohumeral joint.
- All rotator cuff muscle tendons converge at the humeral head.
- The serratus anterior originates from eight ribs.
- The subscapularis muscle inserts on the lesser tubercle of the humerus.
- The supraspinatus muscle inserts on the greater tubercle of the humerus.
- The teres major adducts the arm but does not abduct it.
- Teres minor also inserts on the greater tubercle of the humerus.
- The trapezius muscle is categorized into three groups, excluding lateral.
- The spinal accessory nerve innervates all fibers of the trapezius muscle.
Miscellaneous
- The levator ani muscle can be identified and includes innervation by S3, S4, and the inferior rectal nerve.
- Abnormal protrusion of the small intestine through a weak point in the abdominal wall is termed a hernia.
- The teres major acts as a synergist with the latissimus dorsi, assisting in extending, medially rotating, and adducting the humerus.
- Incorrectly paired functions include the pectoral major, which is correctly known for its role in arm adduction, not abduction.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of anatomy with these flashcards focused on Chapter 10.7. Each card features key terms related to the human muscular system, specifically the pectoralis major and latissimus dorsi muscles. Ideal for students wanting to reinforce their understanding of axial muscles.
