Anatomy LC 10A: Muscular System

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Questions and Answers

What is the primary function of fascia in the muscular system?

To increase muscle size

To surround and separate individual muscles (correct)

To enhance muscle flexibility

To facilitate muscle contraction

Which of the following components is NOT part of the major components of the muscular system?

Skeletal muscle tissue

Blood vessels

Connective tissue

Cartilage (correct)

What is a raphe in the context of muscle anatomy?

The interdigitation of tendinous ends of flat muscles (correct)

A sheet-like connective tissue

A bundle of skeletal muscle fibers

The fleshy part of the muscle

What term is used for the bundles of skeletal muscle fibers?

Fascicles Signup and view all the answers

Which connective tissue structure connects muscle to muscle?

Aponeurosis Signup and view all the answers

What characteristic of skeletal muscle fibers contributes to the formation of the raphe?

Their length and interdigitation Signup and view all the answers

Which of the following is NOT a type of connective tissue associated with skeletal muscles?

Perichondrium Signup and view all the answers

In skeletal muscle structure, what part is referred to as the 'belly'?

The fleshy part of the muscle Signup and view all the answers

What is the primary function of the Golgi Tendon Organ (GTO)?

To inhibit muscle contraction Signup and view all the answers

What type of inhibition is associated with the Golgi Tendon Organ?

Autogenic inhibition Signup and view all the answers

Which fibers make up the sympathetic nerve supply to muscle walls?

Nonmyelinated fibers Signup and view all the answers

What percentage of a mixed nerve is composed of motor fibers?

60% Signup and view all the answers

What is the role of muscle spindles in contrast to Golgi Tendon Organs?

To stimulate muscle contraction Signup and view all the answers

Where is the nerve typically positioned when entering a muscle?

Near the motor point Signup and view all the answers

Which type of fibers provide sensory information to a mixed nerve?

Myelinated fibers Signup and view all the answers

What is the primary purpose of the GTO in muscle function?

Preventing excessive tension Signup and view all the answers

What role does the epimysium play in muscle structure?

It binds fascicles together and closely surrounds skeletal muscle. Signup and view all the answers

Which connective tissue structure is responsible for dividing the muscle into sections called fascicles?

Perimysium Signup and view all the answers

What is the primary composition of the endomysium?

Collagen and reticular fibers Signup and view all the answers

What does the endomysium facilitate in muscle function?

It allows muscle contraction while maintaining structural integrity. Signup and view all the answers

Which of the following statements is true about the perimysium?

It allows for the activation of specific subsets of muscle fibers within a fascicle. Signup and view all the answers

What is the relationship between fascicles and connective tissue in muscle structure?

Connective tissue binds fascicles together, enabling muscle function. Signup and view all the answers

Which statement best describes a muscle fiber?

It consists of myofibrils and is formed of thick and thin filaments. Signup and view all the answers

How does the connective tissue around muscles contribute to their overall function?

It allows muscles to contract powerfully while maintaining structural integrity. Signup and view all the answers

Study Notes

Major Components of the Muscular System

Composed of connective tissue, skeletal muscle tissue, blood vessels, and nerves.

Structure of Skeletal Muscles

Muscle belly represents the fleshy part of the muscle.
Covered by fascia, which encompasses both superficial and deep layers for large muscle groups.

Connective Tissue Coverings of Muscles

Fascia: Surrounds individual muscles; separates them from other muscles and can extend to form tendons or aponeuroses.
Fascicles: Bundles of muscle fibers, bound together by connective tissue.
Epimysium: Dense connective tissue that closely surrounds skeletal muscles and binds fascicles together.
Perimysium: Divides muscle into fascicles and surrounds each fascicle, allowing specific muscle fibers to be activated.
Endomysium: Surrounds individual muscle fibers, composed of collagen and reticular fibers, facilitating power transfer to tendons.

Muscle Fiber Organization

Muscle fibers are composed of myofibrils, further made up of thick and thin filaments.
Each muscle fiber is individually wrapped, promoting structural integrity during contractions.

Golgi Tendon Organ (GTO) Function

When stimulated, GTO causes muscle relaxation, preventing over-contraction and potential injury. This process is known as autogenic inhibition.

Nerve Supply to Muscles

Nerves entering skeletal muscles are mixed nerves, containing motor (60%) and sensory (40%) components.
Motor Supply:
- Alpha fibers arise from large anterior gray horn cells.
- Gamma fibers originate from smaller spinal cord cells.
Sensory Supply: Provided by myelinated fibers from sensory endings within muscle or tendon.

Muscle Attachments and Actions

Muscle actions are influenced primarily by their attachments to the skeletal system, determining movement and function.

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Description

This quiz covers the major components of the muscular system, focusing on the head and neck as part of Anatomy LC 10A. It includes topics such as connective tissue, skeletal muscle tissue, blood vessels, and nerves. Prepare to test your knowledge about skeletal muscle and its organization.

Anatomy LC 10A: Muscular System - Head and Neck