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Anatomical Study of Accessory Head of Flexor Pollicis Longus and Its Clinical Significance
Bipinchandra Khade1, Gunwant Chaudhari2, Nisha Yadav3, Ashutosh Mangalgiri4
1 Associate Professor, Department of Anatomy, Chirayu Medical College and Hospital, Bhopal, Madhya Pradesh, India
2 Professor, Department of Anatomy, Zydus Medical College, Dahod, Gujarat, India
3 Assistant Professor, Department of Anatomy, Uttar Pradesh University of Medical Sciences, Saifai, Itawah, Uttar Pradesh, India
4 Professor, Department of Anatomy, Chirayu Medical College and Hospital, Bhopal, Madhya Pradesh, India
Correspondence Address:
Bipinchandra Khade
Department of Anatomy, Chirayu Medical College and Hospital, Bhopal - 462 030, Madhya Pradesh
India
 Source of Support: None, Conflict of Interest: None
DOI: 10.4103/NJCA.NJCA_59_20
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Background: Cases of nerve entrapment are commonly seen in medical practice. The flexor pollicis longus muscle of the front of the forearm sometimes may have an accessory head. The accessory head of flexor pollicis longus muscle (AHFPL) may compress the anterior interosseus nerve (AIN) to cause weakness of the deep muscles of the front of the forearm. The aim of the present study is to find the incidence of AHFPL and to identify its structural relationships to the median nerve and AIN. Methods: A total of sixty upper limbs of thirty embalmed cadavers were dissected and studied for the presence of AHFPL. Parameters studied were incidence of AHFPL, whether it is bilateral or unilateral, its origin and insertion, and its relationship with AIN. Results: AHFPL was found in 16 cadavers (53%). In 7 out of the 16 cadavers (43.75%), AHFPL was bilateral and in 9 out of 16 cadavers (56.25%), AHFPL was unilateral. AIN was located below the AHFPL in 14 cadavers and in 2 cadavers, it was passing above the AHFPL. The nerve supply of AHFPL was through AIN in the 16 cadavers. Conclusion: Knowledge of AHFPL and its relations with AIN may help medical professionals in diagnosis and treatment as this anatomical variation can lead to compression neuropathy.
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