Intrinsic Foot Muscles Quiz

Questions and Answers

What is the primary action of the quadratus plantae muscle?

Extends the toes at the PIP and DIP joints

Straightens the pull of the flexor digitorum redis (correct)

Flexes the toes at the MTP joints

Adducts the toes

Which nerve innervates the first lumbrical muscle?

Medial dorsal nerve

Medial plantar nerve (correct)

Lateral plantar nerve

Superficial peroneal nerve

What is a key functional role of the lumbrical muscles in the foot?

Providing stability to the ankle joint

Extending the MTP joints and flexing the PIP and DIP joints

Flexing the MTP joints and extending the PIP and DIP joints (correct)

Adducting the toes during walking

Which roots contribute to the innervation of lumbricals #2, #3, and #4?

S2, S3 Signup and view all the answers

Which statement about the foot's intrinsic muscles is true?

Lumbricals #2, #3, and #4 assist in the extension of the PIP and DIP joints Signup and view all the answers

What is the primary role of the quadratus plantae muscle in foot biomechanics?

Straightens the pull of the flexor digitorum longus Signup and view all the answers

Which lumbrical muscle is innervated by the medial plantar nerve?

Lumbrical #1 Signup and view all the answers

Which nerve roots are involved in the innervation of the quadratus plantae?

S2, S3 Signup and view all the answers

What is the action of the lumbrical muscles #2, #3, and #4 in relation to the proximal interphalangeal joints?

Extension at the proximal interphalangeal joints Signup and view all the answers

Which nerve innervates lumbrical #2, #3, and #4?

Lateral plantar nerve Signup and view all the answers

Study Notes

Intrinsic Foot Muscles

Quadratus Plantae: A muscle in the second layer of the foot that helps to straighten the pull of the flexor digitorum longus (FDL).
Nerve Supply: Innervated by the lateral plantar nerve; roots originate from S2 and S3 spinal nerves.

Lumbricals

Lumbrical #1:
- Innervated by the medial plantar nerve.
- Roots from S1 and S2 spinal nerves.
- Primary action is to flex the metatarsophalangeal (MTP) joints of toes 2-5.
Lumbrical #2, #3, #4:
- Innervated by the lateral plantar nerve.
- Roots from S2 and S3 spinal nerves.
- Functions include extending the proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints of toes 2-4.

Intrinsic Foot Muscles

Quadratus Plantae: A muscle in the second layer of the foot that helps to straighten the pull of the flexor digitorum longus (FDL).
Nerve Supply: Innervated by the lateral plantar nerve; roots originate from S2 and S3 spinal nerves.

Lumbricals

Lumbrical #1:
- Innervated by the medial plantar nerve.
- Roots from S1 and S2 spinal nerves.
- Primary action is to flex the metatarsophalangeal (MTP) joints of toes 2-5.
Lumbrical #2, #3, #4:
- Innervated by the lateral plantar nerve.
- Roots from S2 and S3 spinal nerves.
- Functions include extending the proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints of toes 2-4.

Description

Test your knowledge on the intrinsic foot muscles, specifically focusing on the 2nd layer muscles including quadratus plantae and the lumbricals. This quiz covers their actions, innervation by the lateral and medial plantar nerves, and associated nerve roots. Ideal for students of anatomy or physiotherapy.