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Questions and Answers
What type of muscles are the extraocular muscles?
What type of muscles are the extraocular muscles?
- Smooth muscles
- Voluntary muscles (correct)
- Cardiac muscles
- Involuntary muscles
What is the function of the ciliary muscles and iris sphincter?
What is the function of the ciliary muscles and iris sphincter?
- Regulate pupil size and accommodation for near vision (correct)
- Control the movement of the globe
- Control the movement of internal ocular structures
- Assist in maintaining the shape of the eyeball
What surrounds a striated muscle and is known as the epimysium?
What surrounds a striated muscle and is known as the epimysium?
- Connective tissue sheath (correct)
- Endomysium
- Perimysium
- Muscle fibres
Where are the nuclei arranged in a striated muscle fibre?
Where are the nuclei arranged in a striated muscle fibre?
Flashcards
What type of muscles are extraocular muscles?
What type of muscles are extraocular muscles?
The extraocular muscles are voluntary. This means that they are controlled by the conscious mind.
What do ciliary muscles and iris sphincter control?
What do ciliary muscles and iris sphincter control?
The ciliary muscles and iris sphincter both regulate pupil size. They control the amount of light that enters the eye.
What is the name of the connective tissue sheath surrounding a muscle fiber?
What is the name of the connective tissue sheath surrounding a muscle fiber?
Connective tissue surrounds a striated muscle fiber. The name for this sheath is epimysium.
Where are the nuclei located in a striated muscle fiber?
Where are the nuclei located in a striated muscle fiber?
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Study Notes
Muscle Types
- Extraocular muscles are a type of striated muscle.
Functions of Eye Muscles
- The ciliary muscles function to change the shape of the lens for focusing.
- The iris sphincter muscle functions to constrict the pupil.
Muscle Structure
- The epimysium is a layer of connective tissue that surrounds a striated muscle.
Striated Muscle Fibre Structure
- The nuclei are arranged peripherally in a striated muscle fibre.
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