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Why is it difficult to lift a heavy object when the elbow is at full extension?
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Ch. 11 The Muscular System
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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TOC.tableOfContents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Capitolo 11, Problema 31
While unloading her car trunk, Amy strains a muscle and as a result has difficulty moving her arm. The doctor in the emergency room tells her that she strained her pectoralis major. Amy tells you that she thought the pectoralis major was a chest muscle and doesn't understand what that has to do with her arm. What should you tell her?
Guida verificata passo dopo passo1
Explain to Amy that the pectoralis major is indeed a chest muscle, but it also plays a crucial role in moving the arm because it connects the chest to the upper arm bone (humerus).
Describe that the pectoralis major originates from the clavicle, sternum, and ribs, and inserts on the humerus, which allows it to perform movements such as flexion, adduction, and medial rotation of the arm.
Clarify that because the pectoralis major attaches directly to the arm bone, any strain or injury to this muscle can affect arm movement and cause difficulty in moving the arm.
Highlight that muscles often have multiple functions and connections, so a muscle located in one region (like the chest) can influence the movement of another body part (like the arm).
Encourage Amy to understand that the anatomy of muscles involves their origin, insertion, and action, which explains why a chest muscle can impact arm mobility.
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Anatomy of the Pectoralis Major Muscle
The pectoralis major is a large, fan-shaped muscle located in the chest, but it extends from the clavicle and sternum to the humerus (upper arm bone). This connection allows it to influence arm movement despite being classified as a chest muscle.
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2:31
Major Histocompatibility Complexes
Function of the Pectoralis Major in Arm Movement
The pectoralis major is responsible for movements such as flexion, adduction, and medial rotation of the arm. Because it attaches to the humerus, injury to this muscle can cause pain and difficulty when moving the arm.
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06:04Functional Groups
Muscle Strain and Its Effects on Mobility
A muscle strain involves overstretching or tearing muscle fibers, leading to pain, inflammation, and reduced function. When the pectoralis major is strained, it can impair arm mobility due to pain and muscle weakness.
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1:32Effects of the Complement System
Pratica correlata
Domanda del libro di testo
Mary sees Jill coming toward her and immediately contracts her frontalis and procerus. She also contracts her right levator labii. Is Mary glad to see Jill? How can you tell?
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Domanda del libro di testo
Mary's newborn is having trouble suckling. The doctor suggests that it may be a problem with a particular muscle. What muscle is the doctor probably referring to?
(a) Orbicularis oris
(b) Buccinator
(c) Masseter
(d) Risorius
(e) Zygomaticus
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