1. (noun) a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

• involuntary muscle

1. (noun) a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

• muscle
• musculus

2. (noun) muscle tissue that does not appear striated under the microscope; has the form of thin layers or sheets

• muscle
• muscular tissue

1. (noun) a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart)

• musculus sphincter ani internus
• myometrium