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The anterior divisions of the superior and middle trunks unite to form which cord?
Which of the following nerves arises from the roots of the brachial plexus?
The brachial plexus is divided into two parts by the?
How many branches arise from the lateral cord?
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Which of the following cords bears the relationship to the second part of the axillary artery that is indicated by its name?
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The posterior divisions of all three trunks unite to form which cord?
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The anterior divisions of the trunks supply which compartments of the upper limb?
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How many branches arise from the medial cord?
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What is the function of the anterior divisions of the trunks in the brachial plexus?
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Which nerves constitute the roots of the brachial plexus?
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What is the name of the trunk that is a continuation of the C7 root?
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Which part of the brachial plexus gives rise to four branches?
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What is the relationship between the cords and the axillary artery?
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How many branches arise from the medial and posterior cords combined?
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What is the function of the posterior divisions of the trunks in the brachial plexus?
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What is the name of the nerve that arises from the union of the C5 and C6 roots?
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The brachial plexus is formed by the union of the anterior rami of the last five cervical (C4-C8) and the first thoracic (T1) nerves.
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The middle trunk is a continuation of the C6 root.
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The posterior divisions of the trunks supply anterior (flexor) compartments of the upper limb.
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The lateral cord is medial to the axillary artery.
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The brachial plexus is divided into three parts by the clavicle.
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Five branches of the infraclavicular part of the plexus arise from the lateral cord.
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The anterior divisions of the trunks supply posterior (extensor) compartments of the upper limb.
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The medial and posterior cords each give rise to three branches.
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Study Notes
Brachial Plexus Formation
- Formed by the union of the anterior rami of the last four cervical (C5–C8) and the first thoracic (T1) nerves
- Roots of the brachial plexus consist of C5-C8 and T1 nerves
Trunks of the Brachial Plexus
- Superior trunk: formed by the union of the C5 and C6 roots
- Middle trunk: continuation of the C7 root
- Inferior trunk: formed by the union of the C8 and T1 roots
Divisions of the Trunks
- Each trunk divides into anterior and posterior divisions as the plexus passes through the cervico-axillary canal
- Anterior divisions supply anterior (flexor) compartments of the upper limb
- Posterior divisions supply posterior (extensor) compartments
Cords of the Brachial Plexus
- Lateral cord: formed by the union of anterior divisions of the superior and middle trunks
- Medial cord: formed by the anterior division of the inferior trunk
- Posterior cord: formed by the union of posterior divisions of all three trunks
Relationship of Cords to Axillary Artery
- Cords bear a specific relationship to the second part of the axillary artery
- Lateral cord is lateral to the axillary artery
- Medial cord is medial to the axillary artery
- Posterior cord is posterior to the axillary artery
Parts of the Brachial Plexus
- Divided into supraclavicular and infraclavicular parts by the clavicle
- Supraclavicular part gives rise to four branches (dorsal scapular nerve, long thoracic nerve, nerve to subclavius, and suprascapular nerve)
- Infraclavicular part gives rise to branches from the cords (lateral cord: 3 branches, medial cord: 5 branches, posterior cord: 5 branches)
Brachial Plexus Formation
- Formed by the union of the anterior rami of the last four cervical (C5–C8) and the first thoracic (T1) nerves
- Roots of the brachial plexus consist of C5-C8 and T1 nerves
Trunks of the Brachial Plexus
- Superior trunk: formed by the union of the C5 and C6 roots
- Middle trunk: continuation of the C7 root
- Inferior trunk: formed by the union of the C8 and T1 roots
Divisions of the Trunks
- Each trunk divides into anterior and posterior divisions as the plexus passes through the cervico-axillary canal
- Anterior divisions supply anterior (flexor) compartments of the upper limb
- Posterior divisions supply posterior (extensor) compartments
Cords of the Brachial Plexus
- Lateral cord: formed by the union of anterior divisions of the superior and middle trunks
- Medial cord: formed by the anterior division of the inferior trunk
- Posterior cord: formed by the union of posterior divisions of all three trunks
Relationship of Cords to Axillary Artery
- Cords bear a specific relationship to the second part of the axillary artery
- Lateral cord is lateral to the axillary artery
- Medial cord is medial to the axillary artery
- Posterior cord is posterior to the axillary artery
Parts of the Brachial Plexus
- Divided into supraclavicular and infraclavicular parts by the clavicle
- Supraclavicular part gives rise to four branches (dorsal scapular nerve, long thoracic nerve, nerve to subclavius, and suprascapular nerve)
- Infraclavicular part gives rise to branches from the cords (lateral cord: 3 branches, medial cord: 5 branches, posterior cord: 5 branches)
Brachial Plexus Formation
- Formed by the union of the anterior rami of the last four cervical (C5–C8) and the first thoracic (T1) nerves
- Roots of the brachial plexus consist of C5-C8 and T1 nerves
Trunks of the Brachial Plexus
- Superior trunk: formed by the union of the C5 and C6 roots
- Middle trunk: continuation of the C7 root
- Inferior trunk: formed by the union of the C8 and T1 roots
Divisions of the Trunks
- Each trunk divides into anterior and posterior divisions as the plexus passes through the cervico-axillary canal
- Anterior divisions supply anterior (flexor) compartments of the upper limb
- Posterior divisions supply posterior (extensor) compartments
Cords of the Brachial Plexus
- Lateral cord: formed by the union of anterior divisions of the superior and middle trunks
- Medial cord: formed by the anterior division of the inferior trunk
- Posterior cord: formed by the union of posterior divisions of all three trunks
Relationship of Cords to Axillary Artery
- Cords bear a specific relationship to the second part of the axillary artery
- Lateral cord is lateral to the axillary artery
- Medial cord is medial to the axillary artery
- Posterior cord is posterior to the axillary artery
Parts of the Brachial Plexus
- Divided into supraclavicular and infraclavicular parts by the clavicle
- Supraclavicular part gives rise to four branches (dorsal scapular nerve, long thoracic nerve, nerve to subclavius, and suprascapular nerve)
- Infraclavicular part gives rise to branches from the cords (lateral cord: 3 branches, medial cord: 5 branches, posterior cord: 5 branches)
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Description
This quiz covers the formation and structure of the brachial plexus, including its roots, trunks, and divisions. Understand the anatomy of the brachial plexus and its components.
