Peroneus Brevis Practice
Answers
Copyright April 2006 Ted Nissen.
TABLE OF
CONTENTS
1 The correct pronunciation of
peroneus brevis is
3 This muscle is named because of
its
4 The Peroneus Brevis muscle is part
of which muscle group and compartment
5 Which of the following
illustrations depicts the Peroneus Brevis muscle?
6 The origin of the Peroneus Brevis
muscle is ?
7 The insertion of the Peroneus
Brevis muscle is ?
8 What is the fibula and where is it
located?
9 What is an Intermuscular Septa?
10 Which muscles are adjacent to
the peroneus brevis?
11 Which of the following
illustrations depicts the 5th Metatarsal bone?
12 Which of the following joints
are most affected by the action of the peroneus brevis?
13 The action of the peroneus
brevis is ?
14 Plantar Flexion and Eversion are
best demonstrated in which of the following action videos?
15 The nerve supply to the peroneus
brevis is as follows?
16 The peroneus brevis acts on the
ankle joint with what type of leverage?
17 Which muscles act
synergistically with the peroneus brevis in plantar flexion?
18 Which muscle action is muscle
tested for the peroneus brevis and longus?
NOTE: ANSWERS HIGHLIGHTED IN RED ARE THE CORRECT ANSWERS
1 The correct pronunciation of peroneus brevis is
1.1 Peroneal Brevis
1.2 Peroneus Brevis
1.3 Peroneus Brevis
1.4 Peroneus Brevis
2 Peróne means
2.1 Finger or Toe
2.1.1 Sorry wrong answer
2.1.1 Further reading
2.1.1.1 Etymology-Finger or Toe
2.2 Great Toe
2.2.1 Wrong answer
2.2.2 Further reading
2.2.2.1 Etymology-Great Toe
2.3 Belly
2.3.1 This is incorrect
2.3.2 Further reading
2.3.2.1 Etymology-Belly
2.4 Fibula
2.4.1 That is correct
2.4.2 Further reading
2.4.2.1 Etymology-Fibula
3 This muscle is named because of its
3.1 Direction and Location
3.1.1 This answer is half right.
3.1.2 Its true that Peroneus refers to a fibular location (perone=fibula) but brevis does not refer to a direction.
3.1.3 Further reading
3.1.3.1 Direction
3.2 Origin number and shape
3.2.1 This is not correct because neither peroneus nor brevis refer to origin number and shape.
3.2.2 Further reading
3.2.2.1 Number of Origins
3.2.2.2 Shape
3.3 Origin and Insertion
3.3.1 Neither peroneus nor brevis refer to a muscle origin and insertion.
3.3.2 Further reading
3.3.2.1 Origin and Insertion
3.4 Location and Size
3.4.1 This is the correct answer.
3.4.2 Peroneus refers to a fibular location (perone=fibula) and brevis refers to a short size.
3.4.3 Further reading
3.4.3.1 Location
3.4.3.2 Size
4 The Peroneus Brevis muscle is part of which muscle group and compartment
4.1 Leg Posterior Flexor Compartment
4.1.1 This is a wrong answer.
4.1.2 Although the peroneus brevis does plantar flex the foot it is not located on the posterior part of the upper leg.
4.1.3 Further reading
4.1.3.1 Leg (Tibia and Fibula)
4.1.3.2 Posterior Flexor Compartment
4.2
Foot and Toes Lateral Compartment
4.2.1 This is the correct answer
4.2.2 The peroneus brevis is a foot and toe muscle located in the lateral compartment along with the peroneus longus.
4.2.3 Further reading
4.2.3.1 Foot and Toes
4.2.3.2 Lateral (Peroneal) Compartment
4.3 Foot and Toes Posterior Compartment
4.3.1 This answer is half right.
4.3.2 The peroneus brevis is a foot and toe muscle.
4.3.3 The peroneus brevis is not located in the posterior compartment of the leg
4.3.4 Further reading
4.3.4.1 Foot & Toes Posterior Compartment
4.4 Foot and Toes Anterior Compartment
4.4.1 This answer is half right.
4.4.2 The peroneus brevis is a foot and toe muscle.
4.4.3 The peroneus brevis is not located in the anterior compartment
4.4.4 Further reading
4.4.4.1 Foot & Toes Anterior Compartment
5 Which of the following illustrations depicts the Peroneus Brevis muscle?
5.1 Peroneus Brevis
5.1.1 Nope this answer is incorrect
5.1.2 This muscle is the extensor digitorum longus
5.1.3 Further reading
5.1.3.1 Extensor Digitorum Longus
5.2 Peroneus Brevis
5.2.1 Incorrect
5.2.2 This is the Extensor Hallucis Longus
5.2.3 Further reading
5.2.3.1 Extensor Hallucis Longus
5.3 Peroneus Brevis
5.3.1 No
5.3.2 This is the Peroneus Tertius
5.3.3 Like the peroneus brevis it is also attached to the fibula and the 5th metatarsal bone
5.3.4 Further reading
5.3.4.1 Peroneus Tertius
5.4 Peroneus Brevis
5.4.1 This is the correct answer
5.4.2 Further reading
5.4.2.1 Peroneus Brevis
6 The origin of the Peroneus Brevis muscle is ?
6.1 Distal 2/3 of the lateral
surface of the body of fibula
6.1.1 Yes
6.1.2 Further reading
6.1.3 Peroneus Brevis Attachments
6.2 Lateral condyle of the tibia, Head and proximal 3/4 of the anterior surface on the body of the fibula, Proximal portion of the interosseus membrane, Deep fascia, and Adjacent intermuscular septa
6.2.1 Nope this answer is incorrect
6.2.2 This muscle is the extensor digitorum longus
6.2.3 Further reading
6.2.3.1 Extensor Digitorum Longus
6.3 Middle 1/2 ( 2/4) of the anterior surface of the fibula, and the Adjacent interosseous membrane
6.3.1 Incorrect
6.3.2 This is the Extensor Hallucis Longus
6.3.3 Further reading
6.3.3.1 Extensor Hallucis Longus
6.4 Distal 1/3 of the anterior surface of the fibula, Interosseous membrane, and the adjacent intermuscular septum
6.4.1 No
6.4.2 This is the Peroneus Tertius
6.4.3 Like the peroneus brevis it is also attached to the fibula and the 5th metatarsal bone
6.4.4 Further reading
6.4.5 Peroneus Tertius
7 The insertion of the Peroneus Brevis muscle is ?
7.1 Inserts on to the dorsal surfaces of the bases of the middle and distal phalanges of the 2nd -5th toes
7.1.1 This is the insertion point for the extensor digitorum longus
7.1.2 Further reading
7.1.2.1 Extensor Digitorum Longus
7.2 Dorsal surface of base of distal phalanx of hallux (big toe)
7.2.1 This is the insertion point for the Extensor Hallucis Longus
7.2.2 Further reading
7.2.2.1 Extensor Hallucis Longus
7.3 Dorsal surface of the base of the 5th metatarsal
7.3.1 This is the insertion point for the Peroneus Tertius
7.3.2 Further reading
7.3.3 Peroneus Tertius
7.4 Tuberosity on lateral side
of base of 5th metatarsal
7.4.1 This is the Peroneus Brevis insertion point.
7.4.2 Further reading
7.4.3 Peroneus Brevis Attachments
8 What is the fibula and where is it located?
8.1 A weight bearing foot bone that articulates with the tibia and fibula to form the ankle joint
8.1.1 This is the talus which is one of the 7 tarsal bones
8.1.2 Further reading
8.1.2.1 Tarsus
8.2 A non-weight bearing lower leg bone that is smaller,
parallel, and lateral to the tibia
8.2.1 This is the correct answer
8.2.2 Further reading
8.2.2.1 Fibula
8.3 Also known as the heal bone which articulates with many other tarsal bones and plays a major role in weight bearing
8.3.1 This is the calcaneus which is one of the 7 tarsal bones
8.3.2 Further reading
8.3.2.1 Tarsus
8.4 Also known as the shin bone, it is the larger medial bone of the lower leg and as such bears the major portion of the weight of the leg
8.4.1 This is the tibia which is one of two lower leg bones the other being the fibula
8.4.2 Further reading
8.4.2.1 Tibia
9 What is an Intermuscular Septa?
9.1 A wall or partition between muscles
9.1.1 Yes
9.1.2 Further reading
9.1.2.1 Intermuscular Septa
9.2 Dense collagenous connective tissue that is regularly arranged
9.2.1 Intermuscular Septa is a type of Dense (Collagenous) Connective Tissue but it is irregularly arranged. Explore the links below for the difference.
9.2.2 Further reading
9.2.2.1 Connective Tissue-Irregularly Arranged
9.2.2.2 Connective Tissue-Regularly Arranged
9.3 Plantar aponeuroses on the bottom of the foot
9.3.1 The plantar aponeuroses is on the bottom of the foot and many anatomists consider it an extension of the achilles tendon. It functions in part to support the arch of the foot during the push off phase of gait.
9.3.2 Further reading
9.3.2.1 Plantar Aponeurosis
9.4 Myofibers within muscle cells
9.4.1 Myofibers are muscle cells
9.4.2 Further reading
9.4.2.1 Myofibers
10 Which muscles are adjacent to the peroneus brevis?
10.1 Soleus and Tibialis Anterior
10.1.1 As you can see from the illustration below the soleus is lateral to the peroneus longus and the tibialis anterior is medial to the Extensor Digitorum Longus. These muscles then cannot be adjacent to the peroneus brevis.
10.1.2 Further reading
10.1.2.1.1 Superficial Muscles and Tendons of the Right Lower Thigh and Leg, Lateral View
10.2 Transverse Crural, Cruciate Crural, Laciniate, Superior and Inferior Peroneal Retinacula
10.2.1 These are not muscles but rather bands of ligaments around the ankle which help fix the foot and toe muscles during walking or other activity.
10.2.2 Further reading
10.2.2.1 Retinaculum
10.2.2.2 Transverse Crural Ligament
10.2.2.3 Cruciate Crural Ligament
10.2.2.4 Laciniate Ligament
10.2.2.5 Peroneal Retinacula (Superior and Inferior)
10.3 Peroneus Longus and Extensor Digitorum Longus
10.3.1 The peroneus brevis is sandwiched between these two muscles
10.3.2 Further reading
10.3.2.1.1 Muscles of the Anterior Compartment of the Leg
10.4 Peroneus Longus and Peroneus Tertius
10.4.1 The peroneus longus is adjacent to the peroneus brevis muscle but the peroneus tertius is on the medial side of the extensor digitorum longus and therefore not adjacent to the peroneus brevis. The peroneus tertius does share attachment with the peroneus brevis to the 5th metatarsal bone.
10.4.2 Further reading
10.4.2.1.1 Nerves and Arteries of the Anterior and Lateral Compartments of the Leg
11 Which of the following illustrations depicts the 5th Metatarsal bone?
11.1 5th Metatarsal Bone
11.1.1 This is the 5th metatarsal Bone, which serves to attach both the peroneus brevis and peroneus tertius from their origins on the fibula.
11.1.2 Further reading
11.1.2.1 5th Metatarsal
11.1.2.2 Metatarsus
11.1.2.3 Bones of the right Foot, Dorsal View
11.1.2.4 The Fifth Metatarsal Bone
11.2 5th Metatarsal Bone
11.2.1 This is the cuboid bone, which is on the lateral side of the foot. It articulates with the calcaneus and the 5th metatarsal bone as well as other foot bones.
11.2.2 Further reading
11.2.2.1 Cuboid
11.3 5th Metatarsal Bone
11.3.1 The talus is main weight bearing bone of the foot articulating with the tibia and fibula above and the calcaneus below.
11.3.2 Further reading
11.3.2.1 Left Talus
11.4 5th Metatarsal Bone
11.4.1 The calcaneus or heal bone connects with the ground, where weight is transferred from the talus to the calcaneus during the heal strike phase of gait. It articulates with the talus and the cuboid among other bones.
11.4.2 Further reading
11.4.2.1 Left Calcaneus
12 Which of the following joints are most affected by the action of the peroneus brevis?
12.1 Talocalcaneonavicular (TCN)
12.1.1 The peroneus brevis creates tension along a line from the distal fibula to the lateral foot on the proximal end of the 5th metatarsal bone. Because the biomechanical effects are probably felt mostly on the lateral foot the TCN joint which is a medial foot structure is probably less effected by the peroneus brevis.
12.1.2 Further reading
12.1.2.1 Talocalcaneonavicular (TCN)
12.1.2.2 Illustration
12.1.2.2.1 Plantar Ligaments & Joints
12.1.2.2.2 Talocalcaneonavicular (Illustration)
12.1.2.3 Nerve Supply
12.1.2.3.1 Medial Plantar (Tibial)
12.2 Metatarsophalangeal Joints (MP) & Interphalangeal Joints of Toes (IP)
12.2.1 Since the peroneus brevis attaches at the base of the 5th metatarsal its action does not place stresses on the MP or IP joints which are distal structures.
12.2.2 Further reading
12.2.2.1 Metatarsophalangeal Joints (MP)
12.2.2.2 Interphalangeal Joints of Toes (IP)
12.2.2.3 Illustration
12.2.2.3.1 Bones of the right Foot, Dorsal View
12.2.2.3.2 Bones of the Right Foot Plantar View
12.2.2.3.3 Ligaments on the Plantar Surface of the Right Foot (Superficial)
12.2.2.3.4 Plantar Calcaneonavicular Ligament and the Insertions of three Tendons
12.2.2.4 Nerve Supply
12.2.2.4.1 Medial Plantar (Tibial)
12.2.2.5 Lateral Plantar Nerve & Superficial Branch
12.3 Tibiofibular (Inferior or Distal), Talocrural (Ankle) Joint
(ta’’lo-krōōr’al), Subtalar/Talocalcaneal (ta’’lo-kal-ka-ne-al),
Calcaneocuboid, and 5th Tarsometatarsal
12.3.1 This is the correct answer. Because the peroneus brevis is supplied by the Superficial Peroneal Nerve there are no articular branches to the joints mentioned below. Pathology of these joints, then, should not affect the functioning of the peroneus brevis muscle at least in terms of direct neurological connection. However because the peroneus brevis places stress on these joints (ankle plantar flexion & eversion) its functioning may affect the joints ligaments and other structures. The joints below are listed then because the action of this muscle may cause or perpetuate joint dysfunction.
12.3.2 Further reading
12.4 Tibiofibular (Inferior or Distal)
12.4.1.1.1 Nerve Supply
12.4.1.1.1.1 Proximal (Superior) Tibiofibular Joint
12.4.1.1.1.1.1 Common Peroneal (Fibular) Nerve
12.4.1.1.1.1.2 Tibial Nerve
12.4.1.1.1.2 Distal (Inferior) Tibiofibular Joint
12.4.1.1.1.2.1 Tibial Nerve