QuestionSBA
QuestionChoice
This is partially correct. The subscapularis is innervated by the upper and lower subscapular nerves, which is likely to be spared in this form of fracture.
10007753
d
Teres minor and subscapularis
QuestionChoice
This answer is partially correct. The deltoid is innervated by the axillary nerve, and so is likely to be paralysed. However the teres major muscle is innervated by the lower subscapular nerve, and so would likely be spared.
10007751
b
Teres major and deltoid
QuestionChoice
The x-ray demonstrates what appears to be a surgical neck of humerus fracture. The humerus has a very important anatomical relation to the axillary nerve, which wraps around the surgical neck of this bone. This fracture leads to damage to axillary nerve which subsequently paralyses the teres minor and deltoid muscles, which are both innervated by the axillary nerve.

The patient also demonstrates paraesthesia on the upper lateral arm (the skin overlying the insertion of the deltoid on the deltoid tuberosity of the humerus, more commonly known as the regimental badge region) which further points towards injury to the axillary nerve.
10007750
a
Teres minor and deltoid
QuestionChoice
The teres major muscle is innervated by the lower subscapular nerve, which is likely to be spared in this type of fracture.
10007754
e
Teres major
QuestionChoice
These muscles are innervated by the musculocutaneous nerve, which is likely to be spared in this type of fracture. If the musculocutaneous nerve was damaged, the patient would experience paraesthesia on the lateral aspect of the forearm (innervated by the lateral cutaneous nerve of the forearm, which is a distal branch of the musculocutaneous nerve), rather than her upper arm.
10007752
c
Biceps brachii and coracobrachialis
Concept
Chapter
2693
4119
Axillary nerve injury
Topic
145
Orthopaedics
14097
Picture
1519
ProxHumeralFracture.png
images/cqftzsyc1682329906985.jpg
images/cqftzsyc1682329906985_256.jpg
images/cqftzsyc1682329906985_512.jpg
HQgOBgArVwiZmDeoh3WIdnh3DUHQEAU=
Topic
145
Orthopaedics
A 27-year-old woman visits A&E with severe left-sided shoulder pain following an injury that involved a fall onto her outstretched left hand. An X-ray of the shoulder is taken. [lightgallery]

On examination, the patient demonstrates reduced sensation on the lateral aspect of her upper arm. A nerve injury is suspected.

Which of the following muscle(s) are likely to be paralysed?
a